diff --git a/CHANGELOG.md b/CHANGELOG.md
index 739fd968..c7d76630 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,10 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 
 ## [Unreleased]
 
+### Added
+
+- Japanese translation ([#234](https://github.com/jpanther/congo/pull/234))
+
 ### Fixed
 
 - Main content misaligned when hamburger menu is opened at large viewport sizes
diff --git a/i18n/ja.yaml b/i18n/ja.yaml
new file mode 100644
index 00000000..84c8deee
--- /dev/null
+++ b/i18n/ja.yaml
@@ -0,0 +1,55 @@
+article:
+  anchor_label: "アンカー"
+  date: "{{ .Date }}"
+  date_updated: "更新日: {{ .Date }}"
+  draft: "下書き"
+  edit_title: "編集"
+  reading_time:
+    one: "{{ .Count }} 分"
+    other: "{{ .Count }} 分"
+  reading_time_title: "読むのに必要な時間"
+  table_of_contents: "目次"
+  word_count:
+    one: "{{ .Count }} 文字"
+    other: "{{ .Count }} 文字"
+  
+author:
+  byline_title: "著者"
+
+code:
+  copy: "コピー"
+  copied: "コピーしました"
+
+error:
+  404_title: "ページが見つかりませんでした。 :confused:"
+  404_error: "Error 404"
+  404_description: "ご要望のページは存在しないようです。"
+
+footer:
+  dark_appearance: "ダークモードへ切り替え"
+  light_appearance: "ライトモードへ切り替え"
+  powered_by: "Powered by {{ .Hugo }} & {{ .Congo }}"
+
+list:
+  externalurl_title: "外部サイトへリンク"
+  no_articles: "ここに掲載する記事はまだありません。"
+
+nav:
+  scroll_to_top_title: "TOPへスクロール"
+  skip_to_main: "メインコンテンツへスキップ"
+
+search:
+  open_button_title: "検索 (/)"
+  close_button_title: "閉じる (Esc)"
+  input_placeholder: "Search"
+
+sharing:
+  email: " Eメールを送る"
+  facebook: "Facebookでシェアする"
+  linkedin: "LinkedInでシェアする"
+  pinterest: "Pinterestでピンする"
+  reddit: "Redditに投稿する"
+  twitter: "Twitterに投稿する"
+
+shortcode:
+  recent_articles: "最近の記事"
diff --git a/package-lock.json b/package-lock.json
index 9b0707a9..717f48e9 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "hugo-congo-theme",
-  "version": "2.2.2",
+  "version": "2.3.0",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "hugo-congo-theme",
-      "version": "2.2.2",
+      "version": "2.3.0",
       "hasInstallScript": true,
       "license": "MIT",
       "devDependencies": {
@@ -20,6 +20,9 @@
         "rimraf": "^3.0.2",
         "tailwindcss": "^3.1.4",
         "vendor-copy": "^3.0.1"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/jpanther"
       }
     },
     "node_modules/@braintree/sanitize-url": {