diff --git a/js/drag-and-drop.js b/js/drag-and-drop.js
index 85795e9..d0a750e 100644
--- a/js/drag-and-drop.js
+++ b/js/drag-and-drop.js
@@ -24,6 +24,7 @@
     var width = 0;
     var height = 0;
     function onMouseMove(event){
+      event.preventDefault();// タッチによる画面スクロールを止める
       var x = event.clientX;
       var y = event.clientY;