diff --git a/app/src/main/java/org/ntlab/irisclient/DrawingActivity.java b/app/src/main/java/org/ntlab/irisclient/DrawingActivity.java
index 89c2dea..35b928c 100644
--- a/app/src/main/java/org/ntlab/irisclient/DrawingActivity.java
+++ b/app/src/main/java/org/ntlab/irisclient/DrawingActivity.java
@@ -27,6 +27,7 @@
     private List<String> keywordList;
     private Integer drawingNum;
     private Integer drawingNow = 0;
+    private ToggleButton okToggleButton;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
@@ -44,7 +45,7 @@
         findViewById(R.id.eraserButton).setOnClickListener(this);//消しゴムボタン
         findViewById(R.id.blackPenButton).setOnClickListener(this);//消しゴムボタン
 
-        ToggleButton okToggleButton = (ToggleButton) findViewById(R.id.toggleButton);
+        okToggleButton = (ToggleButton) findViewById(R.id.toggleButton);
         okToggleButton.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
             public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                 if (isChecked) {
@@ -122,12 +123,14 @@
 
     @Override
     public void onClick(View v){
-        if(v.getId() == R.id.clearButton){//clearButtonが押されたときの処理
-            drawingCanvas.clearCanvas();
-        }else if(v.getId() == R.id.eraserButton){//eraserButtonが押されたときの処理
-            drawingCanvas.setColor(Color.WHITE);
-        }else if(v.getId() == R.id.blackPenButton){
-            drawingCanvas.setColor(Color.BLACK);
+        if(okToggleButton.isChecked()) {//完了ボタンが押されていないときだけボタンが使える
+            if (v.getId() == R.id.clearButton) {//clearButtonが押されたときの処理
+                drawingCanvas.clearCanvas();
+            } else if (v.getId() == R.id.eraserButton) {//eraserButtonが押されたときの処理
+                drawingCanvas.setColor(Color.WHITE);
+            } else if (v.getId() == R.id.blackPenButton) {
+                drawingCanvas.setColor(Color.BLACK);
+            }
         }
     }