diff --git a/app/src/main/java/org/ntlab/irisclient/DrawingActivity.java b/app/src/main/java/org/ntlab/irisclient/DrawingActivity.java
index fde74de..ffdbe20 100644
--- a/app/src/main/java/org/ntlab/irisclient/DrawingActivity.java
+++ b/app/src/main/java/org/ntlab/irisclient/DrawingActivity.java
@@ -15,6 +15,7 @@
 
 public class DrawingActivity extends AppCompatActivity implements View.OnClickListener {
 
+    private DrawingCanvas drawingCanvas;
     DrawingStateViewModel drawingStateViewModel = new ViewModelProvider(this).get(DrawingStateViewModel.class);
 
     @Override
@@ -22,6 +23,8 @@
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_drawing);
 
+        drawingCanvas = (DrawingCanvas) findViewById(R.id.canvas);
+
         //Irisから必要な情報を取得
         Iris iris = (Iris) this.getApplication();
         String rid = iris.getRid();
@@ -61,9 +64,10 @@
 
     @Override
     public void onClick(View v){
-        if(v.getId() == R.id.okButtton) {
-            //okButtonが押された処理
+        if(v.getId() == R.id.okButtton) {//okButtonが押されたときの処理
             drawingStateViewModel.putDrawing();
+        }else if(v.getId() == R.id.clearButton){//clearButtonが押されたときの処理
+            drawingCanvas.clearCanvas();
         }
     }