diff --git a/frontend/src/api/watchparty.ts b/frontend/src/api/watchparty.ts
index a3de934..e00e53f 100644
--- a/frontend/src/api/watchparty.ts
+++ b/frontend/src/api/watchparty.ts
@@ -164,6 +164,22 @@ export async function createShow(payload: {
     });
 }
 
+export async function deleteArchiveShow(id: number, idToken: string) {
+    if (!idToken) {
+        throw new ApiError("Missing auth token for delete");
+    }
+    const url = `${API_ENDPOINT.v1.SHOWS}?id=${encodeURIComponent(id)}`;
+    await apiFetch<void>(url, {
+        method: "DELETE",
+        headers: {
+            "Authorization": `Bearer ${idToken}`,
+        },
+        timeoutMs: 10_000,
+        expect: "void",
+        logLabel: "delete archived show",
+    });
+}
+
 export async function archiveShow(id: number, idToken: string) {
     if (!idToken) {
         throw new ApiError("Missing auth token for archive");
diff --git a/frontend/src/pages/ArchivePage.tsx b/frontend/src/pages/ArchivePage.tsx
index 79c8732..b445125 100644
--- a/frontend/src/pages/ArchivePage.tsx
+++ b/frontend/src/pages/ArchivePage.tsx
@@ -1,8 +1,8 @@
 import React from "react";
-import { fetchArchive } from "../api/watchparty";
+import { deleteArchiveShow, fetchArchive } from "../api/watchparty";
 import type { ArchiveItem } from "../api/types";
 import { useAuth } from "../auth/AuthProvider";
-import { toastError } from "../utils/toastBus";
+import { toastError, toastInfo } from "../utils/toastBus";
 import { logApiError } from "../utils/logger";
 
 type SortKey = "id" | "ep_num" | "ep_title" | "season_name" | "start_time" | "playback_length" | "date_created" | "date_archived";
@@ -16,11 +16,13 @@ function formatTimestamp(ts: string) {
 }
 
 export default function ArchivePage() {
-    const { enabled, idToken, isAdmin } = useAuth();
+    const { enabled, idToken, isAdmin, verifying } = useAuth();
     const [items, setItems] = React.useState<ArchiveItem[]>([]);
     const [loading, setLoading] = React.useState(true);
     const [error, setError] = React.useState<string | null>(null);
     const [sort, setSort] = React.useState<{ key: SortKey | null; dir: SortDir }>({ key: null, dir: null });
+    const [selectedId, setSelectedId] = React.useState<number | null>(null);
+    const [deletingId, setDeletingId] = React.useState<number | null>(null);
 
     const load = React.useCallback(async () => {
         if (!idToken) {
@@ -32,6 +34,7 @@ export default function ArchivePage() {
             setLoading(true);
             const data = await fetchArchive(idToken);
             setItems(data);
+            setSelectedId((prev) => (prev != null && data.some((it) => it.id === prev) ? prev : null));
         } catch (e: unknown) {
             const msg = e instanceof Error ? e.message : "アーカイブを取得できませんでした。";
             setError(msg);
@@ -95,6 +98,40 @@ export default function ArchivePage() {
         return "";
     };
 
+    const selectedItem = React.useMemo(
+        () => items.find((it) => it.id === selectedId) ?? null,
+        [items, selectedId],
+    );
+
+    const handleSelect = React.useCallback((id: number) => {
+        setSelectedId((prev) => (prev === id ? null : id));
+    }, []);
+
+    async function handleDeleteSelected() {
+        if (!selectedItem) return;
+        if (!enabled) {
+            toastError("認証が無効です", "管理者に確認してください");
+            return;
+        }
+        if (!idToken) {
+            toastError("サインインしてください", "削除には管理者サインインが必要です");
+            return;
+        }
+        try {
+            setDeletingId(selectedItem.id);
+            await deleteArchiveShow(selectedItem.id, idToken);
+            toastInfo("アーカイブを削除しました");
+            setItems((prev) => prev.filter((it) => it.id !== selectedItem.id));
+            setSelectedId(null);
+        } catch (e: unknown) {
+            const msg = e instanceof Error ? e.message : "削除に失敗しました。";
+            toastError("削除に失敗しました", msg);
+            logApiError("delete archived show", e);
+        } finally {
+            setDeletingId(null);
+        }
+    }
+
     if (!enabled) {
         return <div className="subtle">認証が無効です。</div>;
     }
@@ -152,7 +189,20 @@ export default function ArchivePage() {
                             </button>
                         </div>
                         {sortedItems.map((it) => (
-                            <div key={it.id} className="archive-row">
+                            <div
+                                key={it.id}
+                                className={`archive-row ${selectedId === it.id ? "selected" : ""}`}
+                                role="button"
+                                tabIndex={0}
+                                aria-pressed={selectedId === it.id}
+                                onClick={() => handleSelect(it.id)}
+                                onKeyDown={(e) => {
+                                    if (e.key === "Enter" || e.key === " ") {
+                                        e.preventDefault();
+                                        handleSelect(it.id);
+                                    }
+                                }}
+                            >
                                 <span>#{it.id}</span>
                                 <span>第{it.ep_num}話</span>
                                 <span>{it.ep_title}</span>
@@ -166,6 +216,40 @@ export default function ArchivePage() {
                     </div>
                 </div>
             )}
+
+            {selectedItem && (
+                <div className="selection-bar archive-detail-bar">
+                    <div className="selection-meta">
+                        <div className="selection-count">1件選択中</div>
+                        <div className="selection-title">
+                            第{selectedItem.ep_num}話：{selectedItem.ep_title}
+                        </div>
+                        <div className="selection-note">
+                            シーズン {selectedItem.season_name} ・ 開始 {selectedItem.start_time.slice(0, 5)} ・ 再生 {selectedItem.playback_length.slice(0, 5)} ・ ID #{selectedItem.id}
+                        </div>
+                        <div className="selection-note">
+                            アーカイブ日時 {formatTimestamp(selectedItem.date_archived)}
+                        </div>
+                        <div className="selection-note">
+                            {idToken
+                                ? (verifying ? "トークン確認中…" : "サインイン済み")
+                                : "削除には管理者サインインが必要です"}
+                        </div>
+                    </div>
+                    <div className="archive-detail-actions">
+                        <button className="link-btn" type="button" onClick={() => setSelectedId(null)}>
+                            選択をクリア
+                        </button>
+                        <button
+                            className="danger-btn"
+                            disabled={deletingId === selectedItem.id || verifying || !idToken}
+                            onClick={() => handleDeleteSelected().catch(() => { })}
+                        >
+                            {deletingId === selectedItem.id ? "削除中…" : "完全に削除"}
+                        </button>
+                    </div>
+                </div>
+            )}
         </div>
     );
 }