diff --git a/src/i18n/locales/ja.json b/src/i18n/locales/ja.json
index a89cf84a..67bbaa5f 100644
--- a/src/i18n/locales/ja.json
+++ b/src/i18n/locales/ja.json
@@ -87,6 +87,7 @@
       "templates": "テンプレート",
       "layout": "配置",
       "colors": "色",
+      "font-size": "フォントサイズ",
       "fonts": "フォント",
       "actions": "アクション",
       "settings": "設定",