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();
         }
     }
 
diff --git a/app/src/main/res/layout/activity_drawing.xml b/app/src/main/res/layout/activity_drawing.xml
index d630771..db68bde 100644
--- a/app/src/main/res/layout/activity_drawing.xml
+++ b/app/src/main/res/layout/activity_drawing.xml
@@ -6,21 +6,6 @@
     android:layout_height="match_parent"
     tools:context=".DrawingActivity">
 
-    <TextView
-        android:id="@+id/testText"
-        android:layout_width="79dp"
-        android:layout_height="45dp"
-        android:text="test"
-        tools:layout_editor_absoluteX="72dp"
-        tools:layout_editor_absoluteY="16dp" />
-
-    <View
-        android:id="@+id/view"
-        android:layout_width="480dp"
-        android:layout_height="320dp"
-        tools:layout_editor_absoluteX="235dp"
-        tools:layout_editor_absoluteY="75dp" />
-
     <Button
         android:id="@+id/okButtton"
         android:layout_width="87dp"
@@ -29,6 +14,22 @@
         tools:layout_editor_absoluteX="64dp"
         tools:layout_editor_absoluteY="347dp" />
 
+    <Button
+        android:id="@+id/clearButton"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="clear"
+        tools:layout_editor_absoluteX="62dp"
+        tools:layout_editor_absoluteY="280dp" />
+
+    <TextView
+        android:id="@+id/testText"
+        android:layout_width="79dp"
+        android:layout_height="45dp"
+        android:text="test"
+        tools:layout_editor_absoluteX="72dp"
+        tools:layout_editor_absoluteY="16dp" />
+
     <TextView
         android:id="@+id/textView4"
         android:layout_width="95dp"
@@ -44,4 +45,14 @@
         android:text="keyword"
         tools:layout_editor_absoluteX="234dp"
         tools:layout_editor_absoluteY="16dp" />
+
+    <androidx.constraintlayout.widget.ConstraintLayout
+        android:id="@+id/canvas"
+        android:layout_width="482dp"
+        android:layout_height="312dp"
+        tools:layout_editor_absoluteX="234dp"
+        tools:layout_editor_absoluteY="79dp">
+
+    </androidx.constraintlayout.widget.ConstraintLayout>
+
 </androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file