diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4f256aec5c..9ef78c60dc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,7 +4,7 @@
 -
 
 ### Client
--
+- Fix: ログアウトした際に処理が終了しない問題を修正
 
 ### Server
 -
diff --git a/packages/frontend/src/signout.ts b/packages/frontend/src/signout.ts
index c9f9278369..60509d3d07 100644
--- a/packages/frontend/src/signout.ts
+++ b/packages/frontend/src/signout.ts
@@ -6,7 +6,8 @@
 import { apiUrl } from '@@/js/config.js';
 import { defaultMemoryStorage } from '@/memory-storage';
 import { waiting } from '@/os.js';
-import { unisonReload, reloadChannel } from '@/utility/unison-reload.js';
+import { unisonReload } from '@/utility/unison-reload.js';
+import { clear } from '@/utility/idb-proxy.js';
 import { $i } from '@/i.js';
 
 export async function signout() {
@@ -19,13 +20,30 @@ export async function signout() {
 	localStorage.clear();
 	defaultMemoryStorage.clear();
 
-	const idbPromises = ['MisskeyClient', 'keyval-store'].map((name, i, arr) => new Promise<void>((res, rej) => {
+	const idbAbortController = new AbortController();
+	const timeout = window.setTimeout(() => idbAbortController.abort(), 5000);
+
+	const idbPromises = ['MisskeyClient'].map((name, i, arr) => new Promise<void>((res, rej) => {
 		const delidb = indexedDB.deleteDatabase(name);
 		delidb.onsuccess = () => res();
 		delidb.onerror = e => rej(e);
+		delidb.onblocked = () => idbAbortController.signal.aborted && rej(new Error('Operation aborted'));
 	}));
 
-	await Promise.all(idbPromises);
+	try {
+		await Promise.race([
+			Promise.all([
+				...idbPromises,
+				// idb keyval-storeはidb-keyvalライブラリによる別管理
+				clear(),
+			]),
+			new Promise((_, rej) => idbAbortController.signal.addEventListener('abort', () => rej(new Error('Operation timed out')))),
+		]);
+	} catch {
+		// nothing
+	} finally {
+		window.clearTimeout(timeout);
+	}
 
 	//#region Remove service worker registration
 	try {
@@ -50,7 +68,9 @@ export async function signout() {
 			.then(registrations => {
 				return Promise.all(registrations.map(registration => registration.unregister()));
 			});
-	} catch (err) {}
+	} catch {
+		// nothing
+	}
 	//#endregion
 
 	unisonReload('/');
diff --git a/packages/frontend/src/utility/idb-proxy.ts b/packages/frontend/src/utility/idb-proxy.ts
index 20f51660c7..350169a81d 100644
--- a/packages/frontend/src/utility/idb-proxy.ts
+++ b/packages/frontend/src/utility/idb-proxy.ts
@@ -9,6 +9,7 @@ import {
 	get as iget,
 	set as iset,
 	del as idel,
+	clear as iclear,
 } from 'idb-keyval';
 import { miLocalStorage } from '@/local-storage.js';
 
@@ -51,3 +52,7 @@ export async function del(key: string) {
 	if (idbAvailable) return idel(key);
 	return miLocalStorage.removeItem(`${PREFIX}${key}`);
 }
+
+export async function clear() {
+	if (idbAvailable) return iclear();
+}