diff --git a/src/Semi.Avalonia/Locale/ja-jp.axaml b/src/Semi.Avalonia/Locale/ja-jp.axaml
new file mode 100644
index 0000000..e9d10f8
--- /dev/null
+++ b/src/Semi.Avalonia/Locale/ja-jp.axaml
@@ -0,0 +1,24 @@
+<ResourceDictionary xmlns="https://github.com/avaloniaui"
+                    x:Class="Semi.Avalonia.Locale.ja_jp"
+                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+    <!-- DatePicker -->
+    <x:String x:Key="STRING_DATEPICKER_DAY_TEXT">日</x:String>
+    <x:String x:Key="STRING_DATEPICKER_MONTH_TEXT">月</x:String>
+    <x:String x:Key="STRING_DATEPICKER_YEAR_TEXT">年</x:String>
+    <!-- TimePicker -->
+    <x:String x:Key="STRING_TIMEPICKER_HOUR_TEXT">時</x:String>
+    <x:String x:Key="STRING_TIMEPICKER_MINUTE_TEXT">分</x:String>
+    <!-- TextBox/SelectableTextBox flyout -->
+    <x:String x:Key="STRING_MENU_CUT">切り取り</x:String>
+    <x:String x:Key="STRING_MENU_COPY">コピー</x:String>
+    <x:String x:Key="STRING_MENU_PASTE">貼り付け</x:String>
+    <!-- ManagedFileChooser -->
+    <x:String x:Key="STRING_CHOOSER_FILE_NAME">ファイル名</x:String>
+    <x:String x:Key="STRING_CHOOSER_SHOW_HIDDEN_FILES">隠しファイルを表示</x:String>
+    <x:String x:Key="STRING_CHOOSER_DIALOG_OK">確認</x:String>
+    <x:String x:Key="STRING_CHOOSER_DIALOG_CANCEL">キャンセル</x:String>
+    <x:String x:Key="STRING_CHOOSER_NAME_COLUMN">名前</x:String>
+    <x:String x:Key="STRING_CHOOSER_DATEMODIFIED_COLUMN">更新日時</x:String>
+    <x:String x:Key="STRING_CHOOSER_TYPE_COLUMN">種類</x:String>
+    <x:String x:Key="STRING_CHOOSER_SIZE_COLUMN">サイズ</x:String>
+</ResourceDictionary>
diff --git a/src/Semi.Avalonia/Locale/ja-jp.axaml.cs b/src/Semi.Avalonia/Locale/ja-jp.axaml.cs
new file mode 100644
index 0000000..d054d32
--- /dev/null
+++ b/src/Semi.Avalonia/Locale/ja-jp.axaml.cs
@@ -0,0 +1,8 @@
+using Avalonia.Controls;
+
+namespace Semi.Avalonia.Locale;
+
+public class ja_jp: ResourceDictionary
+{
+    
+}
diff --git a/src/Semi.Avalonia/Themes/SemiTheme.axaml.cs b/src/Semi.Avalonia/Themes/SemiTheme.axaml.cs
index 88268f3..3847f18 100644
--- a/src/Semi.Avalonia/Themes/SemiTheme.axaml.cs
+++ b/src/Semi.Avalonia/Themes/SemiTheme.axaml.cs
@@ -14,6 +14,7 @@ public class SemiTheme: Styles
     {
         { new CultureInfo("zh-cn"), new zh_cn() },
         { new CultureInfo("en-us"), new en_us() },
+        { new CultureInfo("ja-jp"), new ja_jp() },
     };
     
     private readonly IServiceProvider? sp;