diff --git a/src/App.jsx b/src/App.jsx
index 96239a0..2970a5e 100644
--- a/src/App.jsx
+++ b/src/App.jsx
@@ -93,9 +93,13 @@ export default function App() {
   }, [playAnim]);
 
   const appStartRef = useRef(Date.now());
+  const lastSwitchRef = useRef(0);
   const handleZoomOut = useCallback(() => {
-    // 起動後15秒は切り替え無効
-    if (Date.now() - appStartRef.current < 15000) return;
+    const now = Date.now();
+    // 起動後15秒、または切り替え後5秒はブロック
+    if (now - appStartRef.current < 15000) return;
+    if (now - lastSwitchRef.current < 5000) return;
+    lastSwitchRef.current = now;
     setView('nasa');
   }, []);
 
@@ -134,9 +138,9 @@ export default function App() {
       {/* NASA center button */}
       {isNasa && (
         <button
-          onClick={() => setView('avatar')}
-          onMouseEnter={() => setView('avatar')}
-          onTouchStart={() => setView('avatar')}
+          onClick={() => { lastSwitchRef.current = Date.now(); setView('avatar'); }}
+          onMouseEnter={() => { lastSwitchRef.current = Date.now(); setView('avatar'); }}
+          onTouchStart={() => { lastSwitchRef.current = Date.now(); setView('avatar'); }}
           style={{
             position: 'absolute', top: '50%', left: '50%',
             transform: 'translate(-50%, -50%)', zIndex: 100,