diff --git a/lang/ja/auth.php b/lang/ja/auth.php
new file mode 100644
index 000000000..6ec1f3801
--- /dev/null
+++ b/lang/ja/auth.php
@@ -0,0 +1,21 @@
+<?php
+
+return [
+
+    /*
+    |--------------------------------------------------------------------------
+    | Authentication Language Lines
+    |--------------------------------------------------------------------------
+    |
+    | The following language lines are used during authentication for various
+    | messages that we need to display to the user. You are free to modify
+    | these language lines according to your application's requirements.
+    |
+    */
+
+    'failed' => '認証情報が一致しません。',
+    'password' => '入力されたパスワードが間違っています。',
+    'loggedout' => 'ログアウトに成功しました。',
+    'throttle' => 'ログイン試行回数が多すぎます。 :seconds 秒後に再試行してください',
+
+];