diff --git a/CHANGELOG.md b/CHANGELOG.md
index 407666b5ae..1e1321b66e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,7 +4,7 @@
 -
 
 ### Client
--
+- Fix: キャッシュをクリアするとテーマ再適用するまでレンダリングが正しく行われない問題を修正
 
 ### Server
 -
diff --git a/packages/frontend/src/theme.ts b/packages/frontend/src/theme.ts
index 13f5dbf60e..4da8c02d33 100644
--- a/packages/frontend/src/theme.ts
+++ b/packages/frontend/src/theme.ts
@@ -242,3 +242,9 @@ export async function installTheme(code: string): Promise<void> {
 	if (!theme) return;
 	await addTheme(theme);
 }
+
+export function clearAppliedThemeCache() {
+	miLocalStorage.removeItem('theme');
+	miLocalStorage.removeItem('themeId');
+	miLocalStorage.removeItem('themeCachedVersion');
+}
diff --git a/packages/frontend/src/utility/clear-cache.ts b/packages/frontend/src/utility/clear-cache.ts
index 8f1f73466f..0e697edcac 100644
--- a/packages/frontend/src/utility/clear-cache.ts
+++ b/packages/frontend/src/utility/clear-cache.ts
@@ -9,14 +9,15 @@ import * as os from '@/os.js';
 import { miLocalStorage } from '@/local-storage.js';
 import { fetchCustomEmojis } from '@/custom-emojis.js';
 import { fetchInstance } from '@/instance.js';
+import { clearAppliedThemeCache } from '@/theme.js';
 
 export async function clearCache() {
 	os.waiting();
 	miLocalStorage.removeItem('instance');
 	miLocalStorage.removeItem('instanceCachedAt');
-	miLocalStorage.removeItem('theme');
 	miLocalStorage.removeItem('emojis');
 	miLocalStorage.removeItem('lastEmojisFetchedAt');
+	clearAppliedThemeCache();
 	await misskeyApiGet('clear-browser-cache', {}).catch(() => {
 		// ignore
 	});