diff --git a/frontend/src/Settings.tsx b/frontend/src/Settings.tsx
index 9276fc2..f7b8c6a 100644
--- a/frontend/src/Settings.tsx
+++ b/frontend/src/Settings.tsx
@@ -170,6 +170,7 @@ export default function Settings({ socket }: Props) {
                                             <MenuItem value="chinese">Chinese</MenuItem>
                                             <MenuItem value="russian">Russian</MenuItem>
                                             <MenuItem value="korean">Korean</MenuItem>
+                                            <MenuItem value="japanese">Japanese</MenuItem>
                                         </Select>
                                     </FormControl>
                                 </Grid>
diff --git a/frontend/src/assets/i18n.yaml b/frontend/src/assets/i18n.yaml
index a41f60d..4849881 100644
--- a/frontend/src/assets/i18n.yaml
+++ b/frontend/src/assets/i18n.yaml
@@ -108,3 +108,21 @@ languages:
     toastConnected: '다음으로 연결됨 '
     toastUpdated: yt-dlp 바이너리를 업데이트 했습니다
     formatSelectionEnabler: Enable video/audio formats selection
+  japanese:
+    urlInput: YouTubeまたはサポート済み動画のURL
+    statusTitle: 状態
+    statusReady: 準備
+    startButton: 開始
+    abortAllButton: すべて中止
+    updateBinButton: yt-dlp更新
+    darkThemeButton: 黒テーマ
+    lightThemeButton: 白テーマ
+    settingsAnchor: 設定
+    serverAddressTitle: サーバーアドレス
+    serverPortTitle: ポート番号
+    extractAudioCheckbox: 音質
+    noMTimeCheckbox: ファイル時間の修正をしない
+    bgReminder: このページを閉じてもバックグラウンドでダウンロードを続けます
+    toastConnected: '接続中 '
+    toastUpdated: yt-dlpを更新しました!
+    formatSelectionEnabler: 選択可能な動画/音源
diff --git a/frontend/src/features/settings/settingsSlice.ts b/frontend/src/features/settings/settingsSlice.ts
index 687a508..9660e42 100644
--- a/frontend/src/features/settings/settingsSlice.ts
+++ b/frontend/src/features/settings/settingsSlice.ts
@@ -2,7 +2,7 @@ import { createSlice, PayloadAction } from "@reduxjs/toolkit"
 import { CliArguments } from "../../classes"
 import { I18nBuilder } from "../../i18n"
 
-export type LanguageUnion = "english" | "chinese" | "russian" | "italian" | "spanish" | "korean"
+export type LanguageUnion = "english" | "chinese" | "russian" | "italian" | "spanish" | "korean" | "japanese"
 export type ThemeUnion = "light" | "dark"
 
 export interface SettingsState {