diff --git a/src/main/java/com/ntlab/irisserver/entities/Turn.java b/src/main/java/com/ntlab/irisserver/entities/Turn.java
index aad634e..b6bae7b 100644
--- a/src/main/java/com/ntlab/irisserver/entities/Turn.java
+++ b/src/main/java/com/ntlab/irisserver/entities/Turn.java
@@ -17,7 +17,7 @@
     @JsonProperty("max")
     private int max;
 
-    private List<List<Member>> questions = new ArrayList<>(); //<cno, List<Menber>>
+    private List<Member> questions[] = new ArrayList[16]; //<cno, List<Menber>>
 
     private List<Cell> openlist = new ArrayList<>();
 
@@ -45,17 +45,17 @@
 
     public List<Cell> getOpenListAll() {return openlist;} //リストそのものを返す。
 
-    public List<List<Member>> getQuestionsList() {return questions;}
+    public List<Member>[] getQuestionsList() {return questions;}
 
     //---------------------------------------------------------
     //questions操作
 
-    public List<Member> getQuestions(int cno){return questions.get(cno);}
+    public List<Member> getQuestions(int cno){return questions[cno];}
 
-    public void addQuestions(int cno, Member m){questions.get(cno).add(m);}
+    public void addQuestions(int cno, Member m){questions[cno].add(m);}
 
     public void delieteQuestions(int cno, Member m){
-        List<Member> list = questions.get(cno);
+        List<Member> list = questions[cno];
         for(Iterator it = list.iterator(); it.hasNext();){
             Member member = (Member) it.next();
             if(member.getNickname() == m.getNickname()){
@@ -66,7 +66,7 @@
 
     }
 
-    public int sizeQuestions(){return questions.size();}
+    public int sizeQuestions(int cno){return questions[cno].size();}
 
     //openlist操作