diff --git a/src/main/java/com/ntlab/irisserver/entities/Drawing.java b/src/main/java/com/ntlab/irisserver/entities/Drawing.java
index fb14640..10926ab 100644
--- a/src/main/java/com/ntlab/irisserver/entities/Drawing.java
+++ b/src/main/java/com/ntlab/irisserver/entities/Drawing.java
@@ -12,14 +12,10 @@
     @JsonProperty("drawing")
     private String drawingPath;
 
-    private Boolean isDrawn = false;
-
     // getter
     public String getDrawing() {return this.drawingPath;}
-    public Boolean getIsDrawn() {return this.isDrawn;}
 
     // setter
     public void setDrawing(String drawing) {this.drawingPath = drawing;}
-    public void setIsDrawn(Boolean isDrawn) {this.isDrawn = isDrawn;}
 
 }
diff --git a/src/main/java/com/ntlab/irisserver/resources/DrawingsRest.java b/src/main/java/com/ntlab/irisserver/resources/DrawingsRest.java
index 2e6b9bd..6057f67 100644
--- a/src/main/java/com/ntlab/irisserver/resources/DrawingsRest.java
+++ b/src/main/java/com/ntlab/irisserver/resources/DrawingsRest.java
@@ -69,8 +69,10 @@
 
             // 絵の情報を上書き
             Drawing drawing = game.getDrawing(dno);
+            if (drawing == null) {
+                drawing = new Drawing();
+            }
             drawing.setDrawing(drawingPath);
-            drawing.setIsDrawn(true);
             game.putDrawing(dno, drawing);
 
         } catch (IOException e) {