diff --git a/apps/client/src/scenes/GameScene.tsx b/apps/client/src/scenes/GameScene.tsx
index 3e3fa2f..bcd9b06 100644
--- a/apps/client/src/scenes/GameScene.tsx
+++ b/apps/client/src/scenes/GameScene.tsx
@@ -53,12 +53,18 @@
   }, [myId]);
 
   return (
-    <div style={{ width: "100vw", height: "100vh", overflow: "hidden", position: "relative", backgroundColor: "#000" }}>
+    <div style={{
+      width: "100vw", height: "100vh", overflow: "hidden", position: "relative", backgroundColor: "#000",
+      userSelect: "none", // 画面全体のテキスト選択を無効化
+      WebkitUserSelect: "none" // Safari対策
+    }}>
       {/* タイマーUIの表示 */}
       <div style={{
         position: "absolute", top: "20px", left: "50%", transform: "translateX(-50%)",
         zIndex: 10, color: "white", fontSize: "32px", fontWeight: "bold",
-        textShadow: "2px 2px 4px rgba(0,0,0,0.5)", fontFamily: "monospace"
+        textShadow: "2px 2px 4px rgba(0,0,0,0.5)", fontFamily: "monospace",
+        userSelect: "none", // 画面全体のテキスト選択を無効化
+        WebkitUserSelect: "none" // Safari対策
       }}>
         {timeLeft}
       </div>
@@ -67,7 +73,7 @@
       <div ref={pixiContainerRef} style={{ position: "absolute", top: 0, left: 0, zIndex: 1 }} />
       
       {/* UI 配置領域 */}
-      <div style={{ position: "absolute", zIndex: 2, width: "100%", height: "100%" }}>
+      <div style={{ position: "absolute", zIndex: 20, width: "100%", height: "100%" }}>
         <VirtualJoystick 
           onMove={(x, y) => { 
             // ジョイスティックの入力を毎フレーム Manager に渡す