diff --git a/visionA-frontend/src/app/devices/[id]/device-detail-client.test.tsx b/visionA-frontend/src/app/devices/[id]/device-detail-client.test.tsx
new file mode 100644
index 0000000..7c261f6
--- /dev/null
+++ b/visionA-frontend/src/app/devices/[id]/device-detail-client.test.tsx
@@ -0,0 +1,172 @@
+/**
+ * DeviceDetailClient 移除裝置（unpair）測試
+ *
+ * 覆蓋（對齊 model-detail-client.test.tsx 的覆蓋風格）：
+ *   - 移除按鈕顯示（裝置載入後）
+ *   - 點移除 → 開確認對話框（二次確認，破壞性操作不可一鍵直接移除）
+ *   - 確認 → 觸發 store.unpairDevice(id)
+ *   - 成功 → toast.success + router.push("/devices")
+ *   - 失敗（FORBIDDEN）→ toast.error，描述用對應 i18n
+ *   - 失敗（未對應 code）→ toast.error 描述退化成 unknown 文案
+ *   - loading 態：unpairingId === id → 觸發鈕 disabled + 顯示「移除中」
+ *
+ * Mock：
+ *   - sonner toast → 攔截 success / error
+ *   - next/navigation useRouter → 攔截 push
+ *   - device-store fetchDevice / unpairDevice → vi.spyOn 控制；selectedDevice 用 setState 注入
+ */
+
+import { fireEvent, render, screen, waitFor } from "@testing-library/react";
+import { afterEach, beforeEach, describe, expect, it, vi, type Mock } from "vitest";
+
+import { LocaleProvider } from "@/lib/i18n/context";
+import { useDeviceStore, type Device } from "@/stores/device-store";
+
+import { DeviceDetailClient } from "./device-detail-client";
+
+vi.mock("sonner", () => {
+  const success = vi.fn();
+  const error = vi.fn();
+  return { toast: Object.assign(vi.fn(), { success, error }) };
+});
+
+const pushMock = vi.fn();
+vi.mock("next/navigation", () => ({
+  useRouter: () => ({
+    push: pushMock,
+    replace: vi.fn(),
+    back: vi.fn(),
+    forward: vi.fn(),
+    refresh: vi.fn(),
+    prefetch: vi.fn(),
+  }),
+}));
+
+import { toast } from "sonner";
+
+const onlineDevice: Device = {
+  id: "dev-1",
+  name: "KL520 Dev Kit",
+  type: "kl520",
+  status: "connected",
+  remoteStatus: "online",
+  lastSeenAt: "2026-04-21T00:00:00Z",
+  firmwareVersion: "2.3.1",
+};
+
+function renderDetail(id = "dev-1") {
+  return render(
+    <LocaleProvider>
+      <DeviceDetailClient id={id} />
+    </LocaleProvider>,
+  );
+}
+
+beforeEach(() => {
+  // fetchDevice 在 useEffect 會被呼叫 — stub 成 no-op，避免打網路；selectedDevice 自行注入。
+  vi.spyOn(useDeviceStore.getState(), "fetchDevice").mockResolvedValue(undefined);
+  useDeviceStore.setState({
+    devices: [],
+    selectedDevice: onlineDevice,
+    isLoading: false,
+    connectingId: null,
+    disconnectingId: null,
+    unpairingId: null,
+    error: null,
+  });
+  pushMock.mockReset();
+  (toast.success as Mock).mockReset();
+  (toast.error as Mock).mockReset();
+});
+
+afterEach(() => {
+  vi.restoreAllMocks();
+  useDeviceStore.setState({ selectedDevice: null, unpairingId: null });
+});
+
+describe("DeviceDetailClient 移除裝置按鈕", () => {
+  it("裝置載入後顯示移除按鈕", () => {
+    renderDetail();
+    expect(screen.getByTestId("device-remove-trigger")).toBeInTheDocument();
+  });
+
+  it("點移除按鈕 → 開二次確認對話框（不直接觸發 unpair）", async () => {
+    const spy = vi.spyOn(useDeviceStore.getState(), "unpairDevice");
+    renderDetail();
+
+    fireEvent.click(screen.getByTestId("device-remove-trigger"));
+
+    // 確認框出現（含確認鈕），但尚未呼叫 unpair
+    await waitFor(() =>
+      expect(screen.getByTestId("device-remove-confirm")).toBeInTheDocument(),
+    );
+    expect(spy).not.toHaveBeenCalled();
+  });
+
+  it("確認後 → 觸發 unpairDevice(id)", async () => {
+    const spy = vi
+      .spyOn(useDeviceStore.getState(), "unpairDevice")
+      .mockResolvedValue({ ok: true });
+    renderDetail();
+
+    fireEvent.click(screen.getByTestId("device-remove-trigger"));
+    fireEvent.click(await screen.findByTestId("device-remove-confirm"));
+
+    await waitFor(() => expect(spy).toHaveBeenCalledWith("dev-1"));
+  });
+
+  it("移除成功 → toast.success + 導回 /devices", async () => {
+    vi.spyOn(useDeviceStore.getState(), "unpairDevice").mockResolvedValue({
+      ok: true,
+    });
+    renderDetail();
+
+    fireEvent.click(screen.getByTestId("device-remove-trigger"));
+    fireEvent.click(await screen.findByTestId("device-remove-confirm"));
+
+    await waitFor(() => expect(toast.success).toHaveBeenCalledOnce());
+    expect(pushMock).toHaveBeenCalledWith("/devices");
+    expect(toast.error).not.toHaveBeenCalled();
+  });
+
+  it("移除失敗（FORBIDDEN）→ toast.error，描述用對應 i18n，不導頁", async () => {
+    vi.spyOn(useDeviceStore.getState(), "unpairDevice").mockResolvedValue({
+      ok: false,
+      code: "FORBIDDEN",
+      message: "not owner",
+    });
+    renderDetail();
+
+    fireEvent.click(screen.getByTestId("device-remove-trigger"));
+    fireEvent.click(await screen.findByTestId("device-remove-confirm"));
+
+    await waitFor(() => expect(toast.error).toHaveBeenCalledOnce());
+    const call = (toast.error as Mock).mock.calls[0];
+    expect(call[1].description).toBe("你沒有權限移除此裝置");
+    expect(pushMock).not.toHaveBeenCalled();
+  });
+
+  it("移除失敗（未對應 code）→ toast.error 描述退化成 unknown 文案", async () => {
+    vi.spyOn(useDeviceStore.getState(), "unpairDevice").mockResolvedValue({
+      ok: false,
+      code: "SOME_UNMAPPED_CODE",
+      message: "x",
+    });
+    renderDetail();
+
+    fireEvent.click(screen.getByTestId("device-remove-trigger"));
+    fireEvent.click(await screen.findByTestId("device-remove-confirm"));
+
+    await waitFor(() => expect(toast.error).toHaveBeenCalledOnce());
+    const call = (toast.error as Mock).mock.calls[0];
+    expect(call[1].description).toBe("發生錯誤，請稍後再試");
+  });
+
+  it("移除中（unpairingId === id）→ 觸發按鈕 disabled 且顯示「移除中」", () => {
+    useDeviceStore.setState({ unpairingId: "dev-1", selectedDevice: onlineDevice });
+    renderDetail();
+    const btn = screen.getByTestId("device-remove-trigger");
+    expect(btn).toBeDisabled();
+    expect(btn).toHaveTextContent("移除中");
+  });
+});
diff --git a/visionA-frontend/src/app/devices/[id]/device-detail-client.tsx b/visionA-frontend/src/app/devices/[id]/device-detail-client.tsx
index d042b2e..7e2ba15 100644
--- a/visionA-frontend/src/app/devices/[id]/device-detail-client.tsx
+++ b/visionA-frontend/src/app/devices/[id]/device-detail-client.tsx
@@ -19,13 +19,27 @@
 
 import { useEffect } from "react";
 import Link from "next/link";
-import { AlertTriangle, ArrowLeft } from "lucide-react";
+import { useRouter } from "next/navigation";
+import { AlertTriangle, ArrowLeft, Trash2 } from "lucide-react";
+import { toast } from "sonner";
 
 import { RemoteDeviceBadge } from "@/components/cloud/remote-device-badge";
+import {
+  AlertDialog,
+  AlertDialogAction,
+  AlertDialogCancel,
+  AlertDialogContent,
+  AlertDialogDescription,
+  AlertDialogFooter,
+  AlertDialogHeader,
+  AlertDialogTitle,
+  AlertDialogTrigger,
+} from "@/components/ui/alert-dialog";
 import { Button } from "@/components/ui/button";
 import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
 import { Separator } from "@/components/ui/separator";
 import { Skeleton } from "@/components/ui/skeleton";
+import { Spinner } from "@/components/ui/spinner";
 import {
   Tooltip,
   TooltipContent,
@@ -40,14 +54,32 @@ interface DeviceDetailClientProps {
 
 export function DeviceDetailClient({ id }: DeviceDetailClientProps) {
   const t = useT();
+  const router = useRouter();
   const selectedDevice = useDeviceStore((s) => s.selectedDevice);
   const isLoading = useDeviceStore((s) => s.isLoading);
   const fetchDevice = useDeviceStore((s) => s.fetchDevice);
+  const unpairDevice = useDeviceStore((s) => s.unpairDevice);
+  const isUnpairing = useDeviceStore((s) => s.unpairingId === id);
 
   useEffect(() => {
     if (id) void fetchDevice(id);
   }, [id, fetchDevice]);
 
+  async function handleRemove() {
+    const result = await unpairDevice(id);
+    if (result.ok) {
+      toast.success(t("devices.remove.toast.success"));
+      router.push("/devices");
+    } else {
+      // 用 backend code 對應 i18n；找不到對應 key 時退化到 unknown（對齊 model download toast）。
+      const key = `devices.remove.error.${result.code}`;
+      const desc = t(key);
+      toast.error(t("devices.remove.error.title"), {
+        description: desc === key ? t("devices.remove.error.unknown") : desc,
+      });
+    }
+  }
+
   if (isLoading && !selectedDevice) {
     return (
       <div className="mx-auto max-w-5xl space-y-4 px-6 py-8">
@@ -128,7 +160,7 @@ export function DeviceDetailClient({ id }: DeviceDetailClientProps) {
             errorMessage={selectedDevice.errorMessage ?? null}
           />
         </div>
-        <div className="flex gap-2">
+        <div className="flex items-center gap-2">
           {isOnline && selectedDevice.flashedModel && (
             <Link href={`/workspace/${selectedDevice.id}`}>
               <Button>{t("devices.openWorkspace")}</Button>
@@ -146,6 +178,58 @@ export function DeviceDetailClient({ id }: DeviceDetailClientProps) {
               </TooltipContent>
             </Tooltip>
           )}
+
+          {/* 移除裝置（破壞性操作）：destructive 樣式 + 二次確認對話框。
+              對齊 model 詳細頁刪除 UX（AlertDialog / loading 態 / 成功導頁 / 失敗 toast）。
+              不論裝置在線與否都可移除——移除是帳號層級的解除配對、與即時連線無關。 */}
+          <AlertDialog>
+            <AlertDialogTrigger asChild>
+              <Button
+                type="button"
+                variant="destructive"
+                size="sm"
+                disabled={isUnpairing}
+                data-testid="device-remove-trigger"
+              >
+                {isUnpairing ? (
+                  <>
+                    <Spinner size="sm" label={t("devices.remove.removing")} />
+                    {t("devices.remove.removing")}
+                  </>
+                ) : (
+                  <>
+                    <Trash2 aria-hidden="true" className="mr-2 size-4" />
+                    {t("devices.remove.action")}
+                  </>
+                )}
+              </Button>
+            </AlertDialogTrigger>
+            <AlertDialogContent>
+              <AlertDialogHeader>
+                <AlertDialogTitle>
+                  {t("devices.remove.confirm.title")}
+                </AlertDialogTitle>
+                <AlertDialogDescription>
+                  {t("devices.remove.confirm.description").replace(
+                    "{name}",
+                    displayName,
+                  )}
+                </AlertDialogDescription>
+              </AlertDialogHeader>
+              <AlertDialogFooter>
+                <AlertDialogCancel disabled={isUnpairing}>
+                  {t("common.cancel")}
+                </AlertDialogCancel>
+                <AlertDialogAction
+                  onClick={handleRemove}
+                  disabled={isUnpairing}
+                  data-testid="device-remove-confirm"
+                >
+                  {t("devices.remove.confirm.action")}
+                </AlertDialogAction>
+              </AlertDialogFooter>
+            </AlertDialogContent>
+          </AlertDialog>
         </div>
       </div>
 
diff --git a/visionA-frontend/src/stores/device-store.test.ts b/visionA-frontend/src/stores/device-store.test.ts
index 4af72fd..4496b7d 100644
--- a/visionA-frontend/src/stores/device-store.test.ts
+++ b/visionA-frontend/src/stores/device-store.test.ts
@@ -22,6 +22,7 @@ beforeEach(() => {
     isLoading: false,
     connectingId: null,
     disconnectingId: null,
+    unpairingId: null,
     error: null,
   });
   // OF2：api.ts 不再需要 token getter（cookie session 由瀏覽器自動帶）
@@ -163,3 +164,97 @@ describe("useDeviceStore", () => {
     expect(err.code).toBe("INTERNAL_ERROR");
   });
 });
+
+describe("useDeviceStore.unpairDevice", () => {
+  const summary = {
+    id: "dev-1",
+    name: "KL520",
+    type: "kl520",
+    status: "connected" as const,
+    remoteStatus: "online" as const,
+  };
+
+  it("成功時打對 endpoint、回 { ok: true }、從 list 移除該裝置且清空 unpairingId", async () => {
+    useDeviceStore.setState({
+      devices: [summary, { ...summary, id: "dev-2" }],
+      selectedDevice: { ...summary },
+    });
+    const fetchSpy = vi.spyOn(globalThis, "fetch").mockResolvedValueOnce(
+      jsonResponse({ success: true, data: { id: "dev-1", unpaired: true } }),
+    );
+
+    const result = await useDeviceStore.getState().unpairDevice("dev-1");
+
+    expect(result).toEqual({ ok: true });
+    // 打到 POST /api/devices/dev-1/unpair
+    const calledUrl = String(fetchSpy.mock.calls[0]?.[0]);
+    expect(calledUrl).toContain("/api/devices/dev-1/unpair");
+    expect(fetchSpy.mock.calls[0]?.[1]).toMatchObject({ method: "POST" });
+
+    const state = useDeviceStore.getState();
+    expect(state.devices.map((d) => d.id)).toEqual(["dev-2"]);
+    // selectedDevice 是被移除的那台 → 清為 null
+    expect(state.selectedDevice).toBeNull();
+    expect(state.unpairingId).toBeNull();
+  });
+
+  it("成功移除非當前 selected 的裝置 → 不動 selectedDevice", async () => {
+    useDeviceStore.setState({
+      devices: [summary, { ...summary, id: "dev-2" }],
+      selectedDevice: { ...summary, id: "dev-2" },
+    });
+    vi.spyOn(globalThis, "fetch").mockResolvedValueOnce(
+      jsonResponse({ success: true, data: { id: "dev-1", unpaired: true } }),
+    );
+
+    await useDeviceStore.getState().unpairDevice("dev-1");
+
+    expect(useDeviceStore.getState().selectedDevice?.id).toBe("dev-2");
+  });
+
+  it("呼叫期間 unpairingId 設為該 id（loading 態）", async () => {
+    let observedDuringCall: string | null = "not-set";
+    vi.spyOn(globalThis, "fetch").mockImplementationOnce(async () => {
+      // fetch 進行中時 store 應已標記 unpairingId
+      observedDuringCall = useDeviceStore.getState().unpairingId;
+      return jsonResponse({ success: true, data: { id: "dev-1", unpaired: true } });
+    });
+
+    await useDeviceStore.getState().unpairDevice("dev-1");
+
+    expect(observedDuringCall).toBe("dev-1");
+    expect(useDeviceStore.getState().unpairingId).toBeNull();
+  });
+
+  it("403 FORBIDDEN（非 owner）→ 回 { ok:false, code:'FORBIDDEN' }，不移除 list，清空 unpairingId", async () => {
+    useDeviceStore.setState({ devices: [summary] });
+    vi.spyOn(globalThis, "fetch").mockResolvedValueOnce(
+      jsonResponse(
+        { success: false, error: { code: "FORBIDDEN", message: "not owner" } },
+        403,
+      ),
+    );
+
+    const result = await useDeviceStore.getState().unpairDevice("dev-1");
+
+    expect(result).toMatchObject({ ok: false, code: "FORBIDDEN" });
+    // 失敗時 list 不變
+    expect(useDeviceStore.getState().devices.map((d) => d.id)).toEqual(["dev-1"]);
+    expect(useDeviceStore.getState().unpairingId).toBeNull();
+    expect(useDeviceStore.getState().error).toBe("not owner");
+  });
+
+  it("404 NOT_FOUND（裝置已刪）→ 回 { ok:false, code:'NOT_FOUND' }", async () => {
+    vi.spyOn(globalThis, "fetch").mockResolvedValueOnce(
+      jsonResponse(
+        { success: false, error: { code: "NOT_FOUND", message: "device not found" } },
+        404,
+      ),
+    );
+
+    const result = await useDeviceStore.getState().unpairDevice("dev-1");
+
+    expect(result).toMatchObject({ ok: false, code: "NOT_FOUND" });
+    expect(useDeviceStore.getState().unpairingId).toBeNull();
+  });
+});
diff --git a/visionA-frontend/src/stores/device-store.ts b/visionA-frontend/src/stores/device-store.ts
index 841fa54..5d2c380 100644
--- a/visionA-frontend/src/stores/device-store.ts
+++ b/visionA-frontend/src/stores/device-store.ts
@@ -109,6 +109,18 @@ function normalizeDevice(raw: unknown): Device {
 /* Store                                                                      */
 /* -------------------------------------------------------------------------- */
 
+/**
+ * unpair（移除裝置）action 的回傳：成功 / 失敗（帶 i18n code 給 UI 顯示 toast）。
+ *
+ * 與 model-store deleteModel 回傳 boolean 的差異：unpair 是破壞性操作，UI 需要對
+ * 「沒有權限（403）/ 裝置不存在（404）/ 其他」分流顯示不同文案，故回 code 而非 boolean。
+ * code 由 ApiError.code 直接帶出（backend api-spec §11 錯誤碼），UI 以 `devices.remove.error.*`
+ * 對應 i18n、找不到對應 key 時退化到 unknown 文案（對齊 model download 的 toast 慣例）。
+ */
+export type UnpairResult =
+  | { ok: true }
+  | { ok: false; code: string; message: string };
+
 interface DeviceState {
   devices: DeviceSummary[];
   selectedDevice: Device | null;
@@ -116,6 +128,8 @@ interface DeviceState {
   /** 連線中的裝置 id（UI 顯示 button spinner）；不使用就是 null */
   connectingId: string | null;
   disconnectingId: string | null;
+  /** 移除（unpair）中的裝置 id（UI 顯示 button spinner / disable 確認鈕）；不使用就是 null */
+  unpairingId: string | null;
   error: string | null;
 
   /** 呼叫 `GET /api/devices` */
@@ -126,6 +140,8 @@ interface DeviceState {
   connectDevice: (id: string) => Promise<boolean>;
   /** 呼叫 `POST /api/devices/:id/disconnect` */
   disconnectDevice: (id: string) => Promise<boolean>;
+  /** 呼叫 `POST /api/devices/:id/unpair`（軟刪裝置 + cascade 撤銷 pairing/session token） */
+  unpairDevice: (id: string) => Promise<UnpairResult>;
   /** 測試 / 雛形用：直接塞 list */
   _setDevices: (devices: DeviceSummary[]) => void;
   /** 測試 / 雛形用：直接塞 selected */
@@ -138,6 +154,7 @@ export const useDeviceStore = create<DeviceState>()((set) => ({
   isLoading: false,
   connectingId: null,
   disconnectingId: null,
+  unpairingId: null,
   error: null,
 
   fetchDevices: async () => {
@@ -199,6 +216,30 @@ export const useDeviceStore = create<DeviceState>()((set) => ({
     }
   },
 
+  unpairDevice: async (id) => {
+    set({ unpairingId: id, error: null });
+    try {
+      // backend 回 envelope { success, data: { id, unpaired: true } }；api.post 已 unwrap data。
+      // 這裡不需用回傳值（成功與否由有無 throw 判定），故不取 response。
+      await api.post(`/api/devices/${encodeURIComponent(id)}/unpair`);
+      // 成功後從本地 list 移除該裝置（避免 refetch 延遲）；若 selected 是它也清掉。
+      set((state) => ({
+        devices: state.devices.filter((d) => d.id !== id),
+        selectedDevice:
+          state.selectedDevice?.id === id ? null : state.selectedDevice,
+        unpairingId: null,
+      }));
+      return { ok: true };
+    } catch (err) {
+      // ApiError 帶 backend error code（FORBIDDEN / NOT_FOUND / …）給 UI 分流 toast；
+      // 其他例外（網路層）退化成 unknown。
+      const message = err instanceof Error ? err.message : String(err);
+      const code = err instanceof ApiError ? err.code : "unknown";
+      set({ unpairingId: null, error: message });
+      return { ok: false, code, message };
+    }
+  },
+
   _setDevices: (devices) => set({ devices }),
   _setSelected: (selectedDevice) => set({ selectedDevice }),
 }));