diff --git a/index.html b/index.html
index 72b36db..989f834 100644
--- a/index.html
+++ b/index.html
@@ -198,7 +198,7 @@ var _COLOR_GRASS = '#388E3C',
   }
 
   function checkHole() {
-    if(bX >= hole[0]-_HOLE_WIDTH/2 && bX <= hole[0]+_HOLE_WIDTH/2 && bY >= hole[1] && bY-_HOLE_WIDTH/2 <= hole[1]+_HOLE_WIDTH/2)
+    if(bX >= hole[0]-_HOLE_WIDTH/2 && bX <= hole[0]+_HOLE_WIDTH/2 && bY >= hole[1]-_HOLE_WIDTH/2 && bY <= hole[1]+_HOLE_WIDTH/2)
       alert('Hole')
   }