diff --git a/app/src/main/java/org/ntlab/irisclient/DrawingCanvas.java b/app/src/main/java/org/ntlab/irisclient/DrawingCanvas.java
index 484798d..5f6f424 100644
--- a/app/src/main/java/org/ntlab/irisclient/DrawingCanvas.java
+++ b/app/src/main/java/org/ntlab/irisclient/DrawingCanvas.java
@@ -25,7 +25,7 @@
         paint = new Paint();//筆の種類
         paint.setColor(Color.BLACK);//色の指定
         paint.setStyle(Paint.Style.STROKE);//線をひく
-        paint.setStrokeWidth(20);//幅
+        paint.setStrokeWidth(15);//幅
     }
 
     //２）onDraw（描画の準備/プロペラが回りだした状態）