diff --git a/src/main/java/com/ntlab/irisserver/entities/Drawing.java b/src/main/java/com/ntlab/irisserver/entities/Drawing.java
index 5710844..c49a153 100644
--- a/src/main/java/com/ntlab/irisserver/entities/Drawing.java
+++ b/src/main/java/com/ntlab/irisserver/entities/Drawing.java
@@ -3,6 +3,9 @@
 import com.fasterxml.jackson.annotation.JsonProperty;
 
 import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
 
 public class Drawing {
 
@@ -21,6 +24,10 @@
     @JsonProperty("isDrawn")
     private Boolean isDrawn;
 
+    // リストに何を持たすかは相談したいところなので仮置き。。。
+    private Map<Integer, Drawing> drawings = new HashMap<>();
+
+
     //-----------------------------------------------------------------
     // getter
     public String getTitle() {