diff --git a/CHANGELOG.md b/CHANGELOG.md
index 08ed5fea4f..eef54a4eb4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,7 @@
 - Enhance: AiScriptAppウィジェットで構文エラーを検知してもダイアログではなくウィジェット内にエラーを表示するように
 - Enhance: /flushページでサイトキャッシュをクリアできるようになりました
 - Enhance: クリップ/リスト/アンテナ/ロール追加系メニュー項目において、表示件数を拡張
+- Enhance: 「キャッシュを削除」ボタンでブラウザの内部キャッシュの削除も行えるように
 - Enhance: 時刻計算のための基準値を一か所で管理するようにし、パフォーマンスを向上
 - Fix: プッシュ通知を有効にできない問題を修正
 - Fix: RSSティッカーウィジェットが正しく動作しない問題を修正
diff --git a/packages/backend/src/server/api/ApiServerService.ts b/packages/backend/src/server/api/ApiServerService.ts
index 32818003ad..57d74ef2b1 100644
--- a/packages/backend/src/server/api/ApiServerService.ts
+++ b/packages/backend/src/server/api/ApiServerService.ts
@@ -176,6 +176,17 @@ export class ApiServerService {
 			}
 		});
 
+		fastify.all('/clear-browser-cache', (request, reply) => {
+			if (['GET', 'POST'].includes(request.method)) {
+				reply.header('Clear-Site-Data', '"cache", "prefetchCache", "prerenderCache", "executionContexts"');
+				reply.code(204);
+				reply.send();
+			} else {
+				reply.code(405);
+				reply.send();
+			}
+		});
+
 		// Make sure any unknown path under /api returns HTTP 404 Not Found,
 		// because otherwise ClientServerService will return the base client HTML
 		// page with HTTP 200.
diff --git a/packages/frontend/src/utility/clear-cache.ts b/packages/frontend/src/utility/clear-cache.ts
index 8a62265438..8f1f73466f 100644
--- a/packages/frontend/src/utility/clear-cache.ts
+++ b/packages/frontend/src/utility/clear-cache.ts
@@ -4,6 +4,7 @@
  */
 
 import { unisonReload } from '@/utility/unison-reload.js';
+import { misskeyApiGet } from '@/utility/misskey-api.js';
 import * as os from '@/os.js';
 import { miLocalStorage } from '@/local-storage.js';
 import { fetchCustomEmojis } from '@/custom-emojis.js';
@@ -16,6 +17,9 @@ export async function clearCache() {
 	miLocalStorage.removeItem('theme');
 	miLocalStorage.removeItem('emojis');
 	miLocalStorage.removeItem('lastEmojisFetchedAt');
+	await misskeyApiGet('clear-browser-cache', {}).catch(() => {
+		// ignore
+	});
 	await fetchInstance(true);
 	await fetchCustomEmojis(true);
 	unisonReload();
diff --git a/packages/misskey-js/etc/misskey-js.api.md b/packages/misskey-js/etc/misskey-js.api.md
index d901232d8f..ac405c1fb0 100644
--- a/packages/misskey-js/etc/misskey-js.api.md
+++ b/packages/misskey-js/etc/misskey-js.api.md
@@ -1449,6 +1449,10 @@ export type Endpoints = Overwrite<Endpoints_2, {
         }>;
         res: AdminRolesCreateResponse;
     };
+    'clear-browser-cache': {
+        req: EmptyRequest;
+        res: EmptyResponse;
+    };
 }>;
 
 // @public (undocumented)
diff --git a/packages/misskey-js/src/api.types.ts b/packages/misskey-js/src/api.types.ts
index fa803194bf..a842f0e47c 100644
--- a/packages/misskey-js/src/api.types.ts
+++ b/packages/misskey-js/src/api.types.ts
@@ -1,6 +1,12 @@
 import { Endpoints as Gen } from './autogen/endpoint.js';
 import { UserDetailed } from './autogen/models.js';
-import { AdminRolesCreateRequest, AdminRolesCreateResponse, UsersShowRequest } from './autogen/entities.js';
+import {
+	AdminRolesCreateRequest,
+	AdminRolesCreateResponse,
+	EmptyRequest,
+	EmptyResponse,
+	UsersShowRequest,
+} from './autogen/entities.js';
 import {
 	PartialRolePolicyOverride,
 	SigninFlowRequest,
@@ -106,6 +112,10 @@ export type Endpoints = Overwrite<
 		'admin/roles/create': {
 			req: Overwrite<AdminRolesCreateRequest, { policies: PartialRolePolicyOverride }>;
 			res: AdminRolesCreateResponse;
-		}
+		},
+		'clear-browser-cache': {
+			req: EmptyRequest;
+			res: EmptyResponse;
+		},
 	}
 >;