diff --git a/public/locales/jp/translation.json b/public/locales/jp/translation.json
new file mode 100644
index 0000000..1a6ab12
--- /dev/null
+++ b/public/locales/jp/translation.json
@@ -0,0 +1,126 @@
+{
+  "Home": "ホーム",
+  "Samples": "サンプル",
+  "Legends": "凡例",
+  "Edit": "編集",
+  "You have to select nodes first": "最初にノードを選択してください",
+  "Test": "テスト",
+  "You can select nodes by dragging or clicking on the graph": "グラフ上でドラッグまたはクリックしてノードを選択できます",
+  "Input a regular expression": "正規表現を入力してください",
+  "Characters": "文字",
+  "Direct match characters": "文字列に直接マッチさせる",
+  "Character classes": "文字クラス",
+  "Distinguish different types of characters": "異なる種類の文字を区別する",
+  "Ranges": "範囲",
+  "One of": "いずれか",
+  "Matches any one of the enclosed characters": "いずれかの文字に一致する",
+  "None of": "これ以外",
+  "Matches anything that is not enclosed in the brackets": "指定した以外の任意の文字に一致する",
+  "Choice": "または",
+  "Group": "グループ",
+  "Matches either \"x\" or \"y\"": "「x」または「y」に一致する",
+  "Quantifier": "量指定子",
+  "Indicate numbers of characters or expressions to match": "一致させる文字または式の数を指定する",
+  "Matches x and remembers the match": "x に一致し、その一致を記憶する",
+  "Matches \"x\" but does not remember the match": "x に一致するが、その一致は記憶しない",
+  "Matches \"x\" and stores it on the groups property of the returned matches under the name specified by <Name>": "「x」に一致し、その一致を <Name> で指定された名前で groups プロパティに保存する",
+  "Back reference": "後方参照",
+  "A back reference to match group #1": "グループ #1 への後方参照",
+  "A back reference to match group #Name": "グループ #Name への後方参照",
+  "Assertion": "アサーション",
+  "Begins with": "先頭",
+  "Ends with": "末尾",
+  "Matches the beginning of input": "入力の先頭に一致する",
+  "Followed by:": "次に続く:",
+  "Not followed by:": "次に続かない:",
+  "Preceded by:": "前にある:",
+  "Not preceded by:": "前にない:",
+  "WordBoundary": "単語境界",
+  "NonWordBoundary": "非単語境界",
+  "Matches \"x\" only if \"x\" is followed by \"y\"": "「x」の次に「y」に続く場合にのみ「x」に一致する",
+  "Global search": "グローバル検索",
+  "Case-insensitive": "大文字と小文字を区別",
+  "Multi-line": "複数行",
+  "Add A Case": "テストケースを追加する",
+  "Insert around": "ノードを挿入",
+  "Group selection": "グループ化",
+  "Lookaround assertion": "先読み/後読みアサーション",
+  "Before": "前に挿入",
+  "Parallel": "「または」",
+  "After": "後に挿入",
+  "show more": "もっと表示する",
+  "show less": "よく使うものだけ表示する",
+  "Expression": "式",
+  "Content": "内容",
+  "An Empty Range": "レンジを追加",
+  "Capturing group": "キャプチャする",
+  "Non-capturing group": "キャプチャしない",
+  "Named capturing group": "名前付きキャプチャ",
+  "Capturing": "キャプチャする",
+  "Non-cap": "キャプチャしない",
+  "Named cap": "名前付きキャプチャ",
+  "Lookahead assertion": "先読みアサーション",
+  "Lookbehind assertion": "後読みアサーション",
+  "Lookahead": "先読み",
+  "Lookbehind": "後読み",
+  "Type": "タイプ",
+  "Value": "値",
+  "Simple string": "単純な文字列",
+  "Character class": "文字クラス",
+  "Character range": "文字範囲",
+  "Beginning Assertion": "先頭",
+  "End Assertion": "末尾",
+  "Word Boundary Assertion": "単語境界",
+  "The input will be escaped automatically.": "入力は自動的にエスケープされます。",
+  "Negate": "否定する",
+  "negate": "否定する",
+  "Any character": "任意の文字",
+  "Any digit": "任意の数字",
+  "Non-digit": "数字以外の文字",
+  "Any alphanumeric": "英数字",
+  "Non-alphanumeric": "英数字以外の文字",
+  "White space": "空白文字",
+  "Non-white space": "空白以外の文字",
+  "Horizontal tab": "水平タブ",
+  "Carriage return": "キャリッジリターン",
+  "Linefeed": "改行文字",
+  "Vertical tab": "垂直タブ",
+  "Form-feed": "フォームフィード",
+  "Backspace": "バックスペース",
+  "NUL": "NUL",
+  "\\b Backspace": "\\b バックスペース",
+  "\\t Horizontal Tab": "\\t 水平タブ",
+  "\\n Line Feed": "\\n 改行",
+  "\\v Vertical Tab": "\\v 垂直タブ",
+  "\\f Form Feed": "\\f フォームフィード",
+  "\\r Carriage Return": "\\r キャリッジリターン",
+  "ASCII symbol": "ASCII文字",
+  "Unicode symbol": "Unicode文字",
+  "Class": "クラス",
+  "Back Reference": "逆参照",
+  "Choose one": "一つ選ぶ",
+  "UnGroup": "グループ解除する",
+  "Cancel assertion": "断言を解除する",
+  "times": "回数",
+  "custom": "カスタム",
+  "1 (default)": "1（デフォルト）",
+  "0 or 1": "あるかないか",
+  "0 or more": "0回以上",
+  "1 or more": "1回以上",
+  "greedy": "貪欲に",
+  "Greedy": "貪欲にマッチ",
+  "1. Whole Numbers": "1. 整数",
+  "2. Decimal Numbers": "2. 小数",
+  "3. Whole + Decimal Numbers": "3. 整数と小数",
+  "4. Negative, Positive Whole + Decimal Numbers": "4. 正負の整数と小数",
+  "6. Date Format YYYY-MM-dd": "6. 日付形式 YYYY-MM-dd",
+  "Flags: ": "フラグ: ",
+  "Flag: ": "フラグ: ",
+  "Allows . to match newline": "ドットが改行に一致することを許可",
+  "Settings: ": "設定: ",
+  "include escape ": "エスケープ文字を含む",
+  "Copy permalink": "パーマリンクをコピー",
+  "Permalink copied.": "パーマリンクがコピーされました",
+  "Empty": "空",
+  "Group's name": "グループ名"
+}
diff --git a/src/components/language-select/index.tsx b/src/components/language-select/index.tsx
index 5aecb50..6466a46 100644
--- a/src/components/language-select/index.tsx
+++ b/src/components/language-select/index.tsx
@@ -22,6 +22,7 @@ export function LanguageSelect() {
           <SelectItem value="en" className="text-xs">English</SelectItem>
           <SelectItem value="cn" className="text-xs">简体中文</SelectItem>
           <SelectItem value="ru" className="text-xs">Русский</SelectItem>
+          <SelectItem value="jp" className="text-xs">日本語</SelectItem>
         </SelectGroup>
       </SelectContent>
     </Select>
diff --git a/src/modules/home/regex-input.tsx b/src/modules/home/regex-input.tsx
index 5b67d61..6d3f9f1 100644
--- a/src/modules/home/regex-input.tsx
+++ b/src/modules/home/regex-input.tsx
@@ -100,7 +100,7 @@ const RegexInput: React.FC<Props> = ({
                   >
                     <div className="flex items-center space-x-2">
                       <CheckboxItem value={value} />
-                      <span>{label}</span>
+                      <span>{t(label)}</span>
                     </div>
                   </label>
                 )