diff --git a/translation.json b/translation.json
index 6ae5afa..c10fdb1 100644
--- a/translation.json
+++ b/translation.json
@@ -1329,6 +1329,91 @@
         "Settings": "설정",
         "Language": "언어"
       }
+    },
+    {
+      "name": "日本語",
+      "code": "ja",
+      "translation": {
+        "AppName": "Tiny File Manager",
+        "AppTitle": "File Manager",
+        "Login": "ログイン",
+        "Username": "Username",
+        "Password": "Password",
+        "Logout": "ログアウト",
+        "Move": "移動",
+        "Copy": "コピー",
+        "Save": "保存",
+        "SelectAll": "すべて選択",
+        "UnSelectAll": "選択解除",
+        "File": "ファイル",
+        "Back": "戻る",
+        "Size": "サイズ",
+        "Perms": "権限",
+        "Modified": "更新日時",
+        "Owner": "所有者",
+        "Search": "検索",
+        "NewItem": "新規作成",
+        "Folder": "フォルダ",
+        "Delete": "削除",
+        "Rename": "名前の変更",
+        "CopyTo": "宛先を指定してコピー",
+        "DirectLink": "直接リンク",
+        "UploadingFiles": "ファイルをアップロード",
+        "ChangePermissions": "権限を変更",
+        "Copying": "ファイルをコピー",
+        "CreateNewItem": "新規作成",
+        "Name": "名前",
+        "AdvancedEditor": "拡張エディタで編集",
+        "RememberMe": "Remember Me",
+        "Actions": "アクション",
+        "Upload": "アップロード",
+        "Cancel": "キャンセル",
+        "InvertSelection": "選択の切り替え",
+        "DestinationFolder": "宛先フォルダ",
+        "ItemType": "種類",
+        "ItemName": "名前",
+        "CreateNow": "作成する",
+        "Download": "ダウンロード",
+        "Open": "開く",
+        "UnZip": "解凍",
+        "UnZipToFolder": "フォルダに解凍",
+        "Edit": "編集",
+        "NormalEditor": "通常エディタで編集",
+        "BackUp": "バックアップ",
+        "SourceFolder": "元フォルダ",
+        "Files": "ファイル",
+        "Change": "変更",
+        "Settings": "設定",
+        "Language": "言語",
+        "MemoryUsed": "メモリ使用量",
+        "PartitionSize": "パーティションサイズ",
+        "ErrorReporting": "エラーを表示",
+        "ShowHiddenFiles": "隠しファイルを表示",
+        "Full size": "合計サイズ",
+        "Help": "ヘルプ",
+        "Free of": "free of",
+        "Preview": "プレビュー",
+        "Help Documents": "ヘルプドキュメント",
+        "Report Issue": "問題を報告",
+        "Generate": "生成",
+        "FullSize": "合計サイズ",
+        "FreeOf": "free of",
+        "CalculateFolderSize": "フォルダサイズを計算",
+        "ProcessID": "プロセスID",
+        "HideColumns": "権限・所有者を非表示",
+        "Check Latest Version": "更新の確認",
+        "Generate new password hash": "パスワードハッシュを生成",
+        "Folder is empty": "空のフォルダです",
+        "Created": "作成しました",
+        "You are logged in": "ログインしました",
+        "Login failed. Invalid username or password": "Username もしくは Password が違います",
+        "password_hash not supported, Upgrade PHP version": "password_hash がサポートされていません。PHPをアップグレードしてください",
+        "Group": "グループ",
+        "Other": "その他",
+        "Read": "読み込み",
+        "Write": "書き込み",
+        "Execute": "実行"
+      }
     }
   ]
 }