diff --git a/locales/ja/auth.json b/locales/ja/auth.json
index 025a3876..76d1005e 100644
--- a/locales/ja/auth.json
+++ b/locales/ja/auth.json
@@ -1,15 +1,15 @@
 {
 	"login": {
-		"INVALID_LOGIN": "E-Mail or Phone not found",
-		"INVALID_PASSWORD": "Invalid Password"
+		"INVALID_LOGIN": "メールまたは電話が見つかりません",
+		"INVALID_PASSWORD": "無効なパスワード"
 	},
 	"register": {
-		"REGISTRATION_DISABLED": "New user registration is disabled",
-		"INVITE_ONLY": "You must be invited to register",
+		"REGISTRATION_DISABLED": "新しいユーザー登録は無効です",
+		"INVITE_ONLY": "登録するには招待する必要があります",
 		"EMAIL_INVALID": "Invalid Email",
-		"EMAIL_ALREADY_REGISTERED": "Email is already registered",
-		"DATE_OF_BIRTH_UNDERAGE": "You need to be {{years}} years or older",
-		"CONSENT_REQUIRED": "You must agree to Terms of Service and Privacy Policy.",
-		"USERNAME_TOO_MANY_USERS": "Too many users have this username, please try another"
+		"EMAIL_ALREADY_REGISTERED": "メールアドレスは既に登録されています",
+		"DATE_OF_BIRTH_UNDERAGE": "{{years}} 歳以上である必要があります",
+		"CONSENT_REQUIRED": "利用規約およびプライバシーポリシーに同意する必要があります。",
+		"USERNAME_TOO_MANY_USERS": "このユーザー名を持つユーザーが多すぎます。別のユーザーをお試しください。"
 	}
 }