diff --git a/frontend/src/components/NacosServiceViewer.interaction.test.tsx b/frontend/src/components/NacosServiceViewer.interaction.test.tsx
index bf0cfd67..2ef92f93 100644
--- a/frontend/src/components/NacosServiceViewer.interaction.test.tsx
+++ b/frontend/src/components/NacosServiceViewer.interaction.test.tsx
@@ -65,8 +65,10 @@ vi.mock('@ant-design/icons', async () => {
   const Icon = () => ReactModule.createElement('span', { 'data-icon': true });
   return {
     DeleteOutlined: Icon,
+    DownOutlined: Icon,
     PlusOutlined: Icon,
     ReloadOutlined: Icon,
+    RightOutlined: Icon,
   };
 });
 
@@ -160,7 +162,7 @@ const instanceHealthSwitch = (renderer: ReactTestRenderer, endpoint: string) =>
 const instanceAction = (
   renderer: ReactTestRenderer,
   endpoint: string,
-  action: 'edit' | 'deregister',
+  action: 'toggle-details' | 'edit' | 'deregister',
 ) => instanceRow(renderer, endpoint)?.find(
   (node) => node.type === 'button' && node.props['data-instance-action'] === action,
 );
@@ -262,6 +264,11 @@ describe('NacosServiceViewer interactions', () => {
           enabled: true,
           ephemeral: false,
           clusterName: 'EDGE',
+          metadata: {
+            version: '20260728163719',
+            slot: 'blue',
+            activeConnections: '2',
+          },
         }, {
           ip: '2001:db8::8',
           port: 8848,
@@ -295,6 +302,11 @@ describe('NacosServiceViewer interactions', () => {
 
     const row = instanceRow(renderer!, '10.0.0.8:8848');
     expect(row?.props.role).toBe('listitem');
+    expect(row?.props['data-instance-details-expanded']).toBe('false');
+    expect(
+      row?.findByProps({ className: 'gn-nacos-instance-row__main' })
+        .findAllByProps({ className: 'gn-nacos-instance-row__actions' }),
+    ).toHaveLength(1);
     expect(row?.findByProps({ className: 'gn-nacos-instance-row__endpoint' }).children)
       .toEqual(['10.0.0.8:8848']);
     expect(row?.findAllByType('dt').map((item) => item.children.join(''))).toEqual([
@@ -302,10 +314,43 @@ describe('NacosServiceViewer interactions', () => {
       'Weight',
       'Type',
     ]);
+    expect(
+      row?.findAllByProps({ className: 'gn-nacos-instance-row__metadata-panel' }),
+    ).toHaveLength(0);
+    expect(
+      instanceAction(renderer!, '10.0.0.8:8848', 'toggle-details')?.props['aria-expanded'],
+    ).toBe(false);
+
+    await act(async () => {
+      instanceAction(renderer!, '10.0.0.8:8848', 'toggle-details')?.props.onClick();
+      instanceAction(renderer!, '[2001:db8::8]:8848', 'toggle-details')?.props.onClick();
+    });
+
+    const expandedRow = instanceRow(renderer!, '10.0.0.8:8848');
+    expect(expandedRow?.props['data-instance-details-expanded']).toBe('true');
+    expect(
+      instanceAction(renderer!, '10.0.0.8:8848', 'toggle-details')?.props['aria-expanded'],
+    ).toBe(true);
+    expect(
+      expandedRow?.findByProps({ className: 'gn-nacos-instance-row__metadata-count' }).children,
+    ).toEqual(['3 entries']);
+    expect(
+      expandedRow?.findAllByProps({ className: 'gn-nacos-instance-row__metadata-key' })
+        .map((item) => item.children.join('')),
+    ).toEqual(['activeConnections', 'slot', 'version']);
+    expect(
+      expandedRow?.findAllByProps({ className: 'gn-nacos-instance-row__metadata-value' })
+        .map((item) => item.children.join('')),
+    ).toEqual(['2', 'blue', '20260728163719']);
+    expect(
+      instanceRow(renderer!, '[2001:db8::8]:8848')
+        ?.findByProps({ className: 'gn-nacos-instance-row__metadata-empty' }).children,
+    ).toEqual(['This instance has no metadata']);
     expect(instanceHealthSwitch(renderer!, '10.0.0.8:8848')?.props['aria-label'])
       .toContain('10.0.0.8:8848');
     expect(instanceAction(renderer!, '10.0.0.8:8848', 'edit')?.props['aria-label'])
       .toContain('10.0.0.8:8848');
+    expect(instanceAction(renderer!, '10.0.0.8:8848', 'edit')?.props.type).toBe('text');
     expect(instanceAction(renderer!, '10.0.0.8:8848', 'deregister')?.props['aria-label'])
       .toContain('10.0.0.8:8848');
   });
diff --git a/frontend/src/components/NacosServiceViewer.tsx b/frontend/src/components/NacosServiceViewer.tsx
index ddcddcd8..eee97e0d 100644
--- a/frontend/src/components/NacosServiceViewer.tsx
+++ b/frontend/src/components/NacosServiceViewer.tsx
@@ -15,8 +15,10 @@ import {
 } from 'antd';
 import {
   DeleteOutlined,
+  DownOutlined,
   PlusOutlined,
   ReloadOutlined,
+  RightOutlined,
 } from '@ant-design/icons';
 import RedisResizableDivider from './RedisResizableDivider';
 import { buildRedisWorkbenchTheme } from './redisViewerWorkbenchTheme';
@@ -103,6 +105,13 @@ const formatNacosInstanceEndpoint = (ip: string, port: number): string => {
   return `${displayHost}:${port}`;
 };
 
+const getNacosInstanceMetadataEntries = (
+  metadata?: Record<string, string>,
+): Array<[string, string]> => Object.entries(metadata || {})
+  .filter(([key]) => key.trim().length > 0)
+  .map(([key, value]): [string, string] => [key, String(value ?? '')])
+  .sort(([leftKey], [rightKey]) => leftKey.localeCompare(rightKey));
+
 const NACOS_SERVICES_CHANGED_EVENT = 'gonavi:nacos-services-changed';
 
 const NacosServiceViewer: React.FC<NacosServiceViewerProps> = ({
@@ -176,6 +185,9 @@ const NacosServiceViewer: React.FC<NacosServiceViewerProps> = ({
   const [selectedServiceRaw, setSelectedServiceRaw] = useState<string | null>(null);
   const [selectedServiceDetail, setSelectedServiceDetail] = useState<NacosServiceDetail | null>(null);
   const [instances, setInstances] = useState<NacosInstance[]>([]);
+  const [expandedInstanceKeys, setExpandedInstanceKeys] = useState<Set<string>>(
+    () => new Set(),
+  );
 
   const [serviceModalOpen, setServiceModalOpen] = useState(false);
   const [savingService, setSavingService] = useState(false);
@@ -208,6 +220,22 @@ const NacosServiceViewer: React.FC<NacosServiceViewerProps> = ({
     () => (selectedServiceRaw ? parseNacosServiceName(selectedServiceRaw) : null),
     [selectedServiceRaw],
   );
+
+  useEffect(() => {
+    setExpandedInstanceKeys(new Set());
+  }, [connectionId, namespaceId, selectedServiceRaw]);
+
+  const toggleInstanceDetails = useCallback((instanceKey: string) => {
+    setExpandedInstanceKeys((current) => {
+      const next = new Set(current);
+      if (next.has(instanceKey)) {
+        next.delete(instanceKey);
+      } else {
+        next.add(instanceKey);
+      }
+      return next;
+    });
+  }, []);
   const serviceRows = useMemo<NacosServiceRow[]>(
     () => serviceNames.map((rawName) => ({ rawName, ...parseNacosServiceName(rawName) })),
     [serviceNames],
@@ -1024,15 +1052,33 @@ const NacosServiceViewer: React.FC<NacosServiceViewerProps> = ({
                 ) : null}
                 {instances.map((instance) => {
                   const endpoint = formatNacosInstanceEndpoint(instance.ip, instance.port);
+                  const instanceKey = `${endpoint}:${instance.clusterName || ''}`;
+                  const detailsExpanded = expandedInstanceKeys.has(instanceKey);
+                  const metadataEntries = getNacosInstanceMetadataEntries(instance.metadata);
                   return (
                     <article
-                      key={`${endpoint}:${instance.clusterName || ''}`}
+                      key={instanceKey}
                       className="gn-nacos-instance-row"
                       data-instance-endpoint={endpoint}
+                      data-instance-details-expanded={detailsExpanded ? 'true' : 'false'}
                       role="listitem"
                     >
                       <div className="gn-nacos-instance-row__main">
                         <div className="gn-nacos-instance-row__identity">
+                          <Button
+                            type="text"
+                            size="small"
+                            className="gn-nacos-instance-row__details-toggle"
+                            icon={detailsExpanded ? <DownOutlined /> : <RightOutlined />}
+                            data-instance-action="toggle-details"
+                            aria-expanded={detailsExpanded}
+                            aria-label={`${tr(
+                              detailsExpanded
+                                ? 'nacos_service.action.collapse_instance_details'
+                                : 'nacos_service.action.expand_instance_details',
+                            )} ${endpoint}`}
+                            onClick={() => toggleInstanceDetails(instanceKey)}
+                          />
                           <span
                             className={[
                               'gn-nacos-instance-row__health-dot',
@@ -1059,6 +1105,37 @@ const NacosServiceViewer: React.FC<NacosServiceViewerProps> = ({
                             onChange={(checked) => void handleToggleHealth(instance, checked)}
                           />
                         </div>
+                        <div className="gn-nacos-instance-row__actions">
+                          <Button
+                            type="text"
+                            size="small"
+                            data-instance-action="edit"
+                            aria-label={`${tr('nacos_service.action.edit_instance')} ${endpoint}`}
+                            disabled={dataEditRestricted}
+                            onClick={() => openEditInstance(instance)}
+                          >
+                            {tr('nacos_service.action.edit_instance')}
+                          </Button>
+                          <Popconfirm
+                            title={tr('nacos_service.message.confirm_deregister', {
+                              ip: instance.ip,
+                              port: instance.port,
+                            })}
+                            disabled={dataEditRestricted}
+                            onConfirm={() => void handleDeregister(instance)}
+                          >
+                            <Button
+                              type="text"
+                              size="small"
+                              danger
+                              data-instance-action="deregister"
+                              aria-label={`${tr('nacos_service.action.deregister')} ${endpoint}`}
+                              disabled={dataEditRestricted}
+                            >
+                              {tr('nacos_service.action.deregister')}
+                            </Button>
+                          </Popconfirm>
+                        </div>
                         <dl className="gn-nacos-instance-row__metadata">
                           <div>
                             <dt>{tr('nacos_service.field.cluster')}</dt>
@@ -1077,35 +1154,45 @@ const NacosServiceViewer: React.FC<NacosServiceViewerProps> = ({
                             </dd>
                           </div>
                         </dl>
-                      </div>
-                      <div className="gn-nacos-instance-row__actions">
-                        <Button
-                          size="small"
-                          data-instance-action="edit"
-                          aria-label={`${tr('nacos_service.action.edit_instance')} ${endpoint}`}
-                          disabled={dataEditRestricted}
-                          onClick={() => openEditInstance(instance)}
-                        >
-                          {tr('nacos_service.action.edit_instance')}
-                        </Button>
-                        <Popconfirm
-                          title={tr('nacos_service.message.confirm_deregister', {
-                            ip: instance.ip,
-                            port: instance.port,
-                          })}
-                          disabled={dataEditRestricted}
-                          onConfirm={() => void handleDeregister(instance)}
-                        >
-                          <Button
-                            size="small"
-                            danger
-                            data-instance-action="deregister"
-                            aria-label={`${tr('nacos_service.action.deregister')} ${endpoint}`}
-                            disabled={dataEditRestricted}
+                        {detailsExpanded ? (
+                          <section
+                            className="gn-nacos-instance-row__metadata-panel"
+                            aria-label={tr('nacos_service.field.instance_metadata')}
                           >
-                            {tr('nacos_service.action.deregister')}
-                          </Button>
-                        </Popconfirm>
+                            <div className="gn-nacos-instance-row__metadata-header">
+                              <span>{tr('nacos_service.field.instance_metadata')}</span>
+                              <span className="gn-nacos-instance-row__metadata-count">
+                                {tr('nacos_service.field.metadata_count', {
+                                  count: metadataEntries.length,
+                                })}
+                              </span>
+                            </div>
+                            {metadataEntries.length > 0 ? (
+                              <ul className="gn-nacos-instance-row__metadata-list">
+                                {metadataEntries.map(([key, value]) => (
+                                  <li key={key} className="gn-nacos-instance-row__metadata-item">
+                                    <span
+                                      className="gn-nacos-instance-row__metadata-key"
+                                      title={key}
+                                    >
+                                      {key}
+                                    </span>
+                                    <span
+                                      className="gn-nacos-instance-row__metadata-value"
+                                      title={value}
+                                    >
+                                      {value || '—'}
+                                    </span>
+                                  </li>
+                                ))}
+                              </ul>
+                            ) : (
+                              <span className="gn-nacos-instance-row__metadata-empty">
+                                {tr('nacos_service.message.instance_metadata_empty')}
+                              </span>
+                            )}
+                          </section>
+                        ) : null}
                       </div>
                     </article>
                   );
diff --git a/shared/i18n/de-DE.json b/shared/i18n/de-DE.json
index fd81dfde..53567111 100644
--- a/shared/i18n/de-DE.json
+++ b/shared/i18n/de-DE.json
@@ -8998,11 +8998,15 @@
   "nacos_service.field.ephemeral": "Ephemeral",
   "nacos_service.field.persistent": "Persistent",
   "nacos_service.field.type": "Typ",
+  "nacos_service.field.instance_metadata": "Instanzmetadaten",
+  "nacos_service.field.metadata_count": "{{count}} Einträge",
   "nacos_service.field.protect_threshold": "Protect-Threshold",
   "nacos_service.action.create_service": "Service erstellen",
   "nacos_service.action.register_instance": "Instanz registrieren",
   "nacos_service.action.edit_instance": "Bearbeiten",
   "nacos_service.action.deregister": "Abmelden",
+  "nacos_service.action.expand_instance_details": "Instanzdetails aufklappen",
+  "nacos_service.action.collapse_instance_details": "Instanzdetails einklappen",
   "nacos_service.message.select_service": "Wählen Sie links einen Service, um Instanzen zu sehen",
   "nacos_service.message.service_create_success": "Service erstellt",
   "nacos_service.message.service_delete_success": "Service gelöscht",
@@ -9010,6 +9014,7 @@
   "nacos_service.message.instance_update_success": "Instanz aktualisiert",
   "nacos_service.message.instance_deregister_success": "Instanz abgemeldet",
   "nacos_service.message.instance_health_success": "Health aktualisiert",
+  "nacos_service.message.instance_metadata_empty": "Diese Instanz enthält keine Metadaten",
   "nacos_service.message.ephemeral_registration_unavailable": "GoNavi erneuert flüchtige Instanzen nicht; die manuelle Registrierung ist nur für persistente Services verfügbar.",
   "nacos_service.message.confirm_delete_service": "Service {{name}} löschen? Nur möglich, wenn keine Instanzen existieren.",
   "nacos_service.message.confirm_deregister": "Instanz {{ip}}:{{port}} abmelden?",
diff --git a/shared/i18n/en-US.json b/shared/i18n/en-US.json
index 0a90e5f1..32348b43 100644
--- a/shared/i18n/en-US.json
+++ b/shared/i18n/en-US.json
@@ -8998,11 +8998,15 @@
   "nacos_service.field.ephemeral": "Ephemeral",
   "nacos_service.field.persistent": "Persistent",
   "nacos_service.field.type": "Type",
+  "nacos_service.field.instance_metadata": "Instance metadata",
+  "nacos_service.field.metadata_count": "{{count}} entries",
   "nacos_service.field.protect_threshold": "Protect threshold",
   "nacos_service.action.create_service": "Create service",
   "nacos_service.action.register_instance": "Register instance",
   "nacos_service.action.edit_instance": "Edit",
   "nacos_service.action.deregister": "Deregister",
+  "nacos_service.action.expand_instance_details": "Expand instance details",
+  "nacos_service.action.collapse_instance_details": "Collapse instance details",
   "nacos_service.message.select_service": "Select a service on the left to view instances",
   "nacos_service.message.service_create_success": "Service created",
   "nacos_service.message.service_delete_success": "Service deleted",
@@ -9010,6 +9014,7 @@
   "nacos_service.message.instance_update_success": "Instance updated",
   "nacos_service.message.instance_deregister_success": "Instance deregistered",
   "nacos_service.message.instance_health_success": "Health updated",
+  "nacos_service.message.instance_metadata_empty": "This instance has no metadata",
   "nacos_service.message.ephemeral_registration_unavailable": "GoNavi does not renew ephemeral instances; manual registration is only available for persistent services.",
   "nacos_service.message.confirm_delete_service": "Delete service {{name}}? Server only allows this when it has no instances.",
   "nacos_service.message.confirm_deregister": "Deregister instance {{ip}}:{{port}}?",
diff --git a/shared/i18n/ja-JP.json b/shared/i18n/ja-JP.json
index b89fbcd2..df3bacff 100644
--- a/shared/i18n/ja-JP.json
+++ b/shared/i18n/ja-JP.json
@@ -8998,11 +8998,15 @@
   "nacos_service.field.ephemeral": "Ephemeral",
   "nacos_service.field.persistent": "永続",
   "nacos_service.field.type": "タイプ",
+  "nacos_service.field.instance_metadata": "インスタンスメタデータ",
+  "nacos_service.field.metadata_count": "{{count}} 件",
   "nacos_service.field.protect_threshold": "保護閾値",
   "nacos_service.action.create_service": "サービス作成",
   "nacos_service.action.register_instance": "インスタンス登録",
   "nacos_service.action.edit_instance": "編集",
   "nacos_service.action.deregister": "抹消",
+  "nacos_service.action.expand_instance_details": "インスタンス詳細を展開",
+  "nacos_service.action.collapse_instance_details": "インスタンス詳細を折りたたむ",
   "nacos_service.message.select_service": "左のサービスを選択してインスタンスを表示",
   "nacos_service.message.service_create_success": "サービスを作成しました",
   "nacos_service.message.service_delete_success": "サービスを削除しました",
@@ -9010,6 +9014,7 @@
   "nacos_service.message.instance_update_success": "インスタンスを更新しました",
   "nacos_service.message.instance_deregister_success": "インスタンスを抹消しました",
   "nacos_service.message.instance_health_success": "ヘルスを更新しました",
+  "nacos_service.message.instance_metadata_empty": "このインスタンスにはメタデータがありません",
   "nacos_service.message.ephemeral_registration_unavailable": "GoNavi は一時インスタンスを更新しないため、手動登録は永続サービスでのみ利用できます。",
   "nacos_service.message.confirm_delete_service": "サービス {{name}} を削除しますか？インスタンスがない場合のみ可能です。",
   "nacos_service.message.confirm_deregister": "インスタンス {{ip}}:{{port}} を抹消しますか？",
diff --git a/shared/i18n/ru-RU.json b/shared/i18n/ru-RU.json
index aa178e31..d3cb8b1e 100644
--- a/shared/i18n/ru-RU.json
+++ b/shared/i18n/ru-RU.json
@@ -8998,11 +8998,15 @@
   "nacos_service.field.ephemeral": "Ephemeral",
   "nacos_service.field.persistent": "Постоянный",
   "nacos_service.field.type": "Тип",
+  "nacos_service.field.instance_metadata": "Метаданные экземпляра",
+  "nacos_service.field.metadata_count": "{{count}} записей",
   "nacos_service.field.protect_threshold": "Protect threshold",
   "nacos_service.action.create_service": "Создать сервис",
   "nacos_service.action.register_instance": "Зарегистрировать инстанс",
   "nacos_service.action.edit_instance": "Изменить",
   "nacos_service.action.deregister": "Снять",
+  "nacos_service.action.expand_instance_details": "Развернуть сведения об инстансе",
+  "nacos_service.action.collapse_instance_details": "Свернуть сведения об инстансе",
   "nacos_service.message.select_service": "Выберите сервис слева, чтобы увидеть инстансы",
   "nacos_service.message.service_create_success": "Сервис создан",
   "nacos_service.message.service_delete_success": "Сервис удалён",
@@ -9010,6 +9014,7 @@
   "nacos_service.message.instance_update_success": "Инстанс обновлён",
   "nacos_service.message.instance_deregister_success": "Регистрация снята",
   "nacos_service.message.instance_health_success": "Health обновлён",
+  "nacos_service.message.instance_metadata_empty": "У экземпляра нет метаданных",
   "nacos_service.message.ephemeral_registration_unavailable": "GoNavi не продлевает временные экземпляры; ручная регистрация доступна только для постоянных сервисов.",
   "nacos_service.message.confirm_delete_service": "Удалить сервис {{name}}? Только если нет инстансов.",
   "nacos_service.message.confirm_deregister": "Снять регистрацию {{ip}}:{{port}}?",
diff --git a/shared/i18n/zh-CN.json b/shared/i18n/zh-CN.json
index b1e1d408..e904c6b1 100644
--- a/shared/i18n/zh-CN.json
+++ b/shared/i18n/zh-CN.json
@@ -8998,11 +8998,15 @@
   "nacos_service.field.ephemeral": "临时",
   "nacos_service.field.persistent": "持久",
   "nacos_service.field.type": "类型",
+  "nacos_service.field.instance_metadata": "实例元数据",
+  "nacos_service.field.metadata_count": "{{count}} 项",
   "nacos_service.field.protect_threshold": "保护阈值",
   "nacos_service.action.create_service": "新建服务",
   "nacos_service.action.register_instance": "注册实例",
   "nacos_service.action.edit_instance": "编辑",
   "nacos_service.action.deregister": "注销",
+  "nacos_service.action.expand_instance_details": "展开实例详情",
+  "nacos_service.action.collapse_instance_details": "折叠实例详情",
   "nacos_service.message.select_service": "请选择左侧服务以查看实例",
   "nacos_service.message.service_create_success": "服务已创建",
   "nacos_service.message.service_delete_success": "服务已删除",
@@ -9010,6 +9014,7 @@
   "nacos_service.message.instance_update_success": "实例已更新",
   "nacos_service.message.instance_deregister_success": "实例已注销",
   "nacos_service.message.instance_health_success": "健康状态已更新",
+  "nacos_service.message.instance_metadata_empty": "该实例未上报元数据",
   "nacos_service.message.ephemeral_registration_unavailable": "GoNavi 不会续约临时实例，仅支持向持久服务手工注册实例。",
   "nacos_service.message.confirm_delete_service": "确认删除服务 {{name}}？仅当无实例时服务端才允许删除。",
   "nacos_service.message.confirm_deregister": "确认注销实例 {{ip}}:{{port}}？",
diff --git a/shared/i18n/zh-TW.json b/shared/i18n/zh-TW.json
index 05154ad0..f0d88f4b 100644
--- a/shared/i18n/zh-TW.json
+++ b/shared/i18n/zh-TW.json
@@ -8998,11 +8998,15 @@
   "nacos_service.field.ephemeral": "臨時",
   "nacos_service.field.persistent": "持久",
   "nacos_service.field.type": "類型",
+  "nacos_service.field.instance_metadata": "實例中繼資料",
+  "nacos_service.field.metadata_count": "{{count}} 項",
   "nacos_service.field.protect_threshold": "保護閾值",
   "nacos_service.action.create_service": "新建服務",
   "nacos_service.action.register_instance": "註冊實例",
   "nacos_service.action.edit_instance": "編輯",
   "nacos_service.action.deregister": "註銷",
+  "nacos_service.action.expand_instance_details": "展開實例詳情",
+  "nacos_service.action.collapse_instance_details": "摺疊實例詳情",
   "nacos_service.message.select_service": "請選擇左側服務以查看實例",
   "nacos_service.message.service_create_success": "服務已建立",
   "nacos_service.message.service_delete_success": "服務已刪除",
@@ -9010,6 +9014,7 @@
   "nacos_service.message.instance_update_success": "實例已更新",
   "nacos_service.message.instance_deregister_success": "實例已註銷",
   "nacos_service.message.instance_health_success": "健康狀態已更新",
+  "nacos_service.message.instance_metadata_empty": "此實例未回報中繼資料",
   "nacos_service.message.ephemeral_registration_unavailable": "GoNavi 不會續約臨時執行個體，僅支援向持久服務手動註冊執行個體。",
   "nacos_service.message.confirm_delete_service": "確認刪除服務 {{name}}？僅當無實例時服務端才允許刪除。",
   "nacos_service.message.confirm_deregister": "確認註銷實例 {{ip}}:{{port}}？",