diff --git a/loc-chase2.js b/loc-chase2.js
index 316659d..8908695 100644
--- a/loc-chase2.js
+++ b/loc-chase2.js
@@ -83,13 +83,6 @@
 
   document.getElementById("stop")
     .addEventListener("click", stopLOC);
-    
-    if ('serviceWorker' in navigator) {
-      navigator.serviceWorker.register('./serviceworker.js')
-  	.then(()=> {
-  	    console.log('service worker registered'); //なくてもよい
-  	});
-  }
 
 
 }, false);