diff --git a/src/main/java/org/ntlab/acanthus_server/entities/Stroke.java b/src/main/java/org/ntlab/acanthus_server/entities/Stroke.java
index 6e1fecf..b659ccf 100644
--- a/src/main/java/org/ntlab/acanthus_server/entities/Stroke.java
+++ b/src/main/java/org/ntlab/acanthus_server/entities/Stroke.java
@@ -26,8 +26,14 @@
     }
 
     //座標のリストを返す
-    public SortedSet<Position> getPositions() {
-        return this.positions;
+    public List<Position> getPositions() {
+
+        List<Position> positions = new ArrayList();
+        for (Position p: positions) {
+            positions.add(p);
+        }
+
+        return positions;
     }
 
     // StrokesRestからstrokesのsizeをもらってstrokeNoに入れる
diff --git a/src/main/java/org/ntlab/acanthus_server/resources/gallery/StrokesRest.java b/src/main/java/org/ntlab/acanthus_server/resources/gallery/StrokesRest.java
index 27dfea5..c426591 100644
--- a/src/main/java/org/ntlab/acanthus_server/resources/gallery/StrokesRest.java
+++ b/src/main/java/org/ntlab/acanthus_server/resources/gallery/StrokesRest.java
@@ -214,11 +214,7 @@
             }
         });*/
 
-        List<Position> positions = new ArrayList();
-        for (Position p: strokes.get(strokeNo).getPositions()) {
-            positions.add(p);
-        }
-        return positions;          // 呼び出したstrokesの情報を返す
+        return strokes.get(strokeNo).getPositions();          // 呼び出したstrokesの情報を返す
 //        if(animation != null) {
 //            return this.positions;
 //        }else{