diff --git a/src/main/java/com/example/cosmos_serversb/models/Users.java b/src/main/java/com/example/cosmos_serversb/models/Users.java
index 8820815..4450341 100644
--- a/src/main/java/com/example/cosmos_serversb/models/Users.java
+++ b/src/main/java/com/example/cosmos_serversb/models/Users.java
@@ -1,21 +1,32 @@
 package com.example.cosmos_serversb.models;
+
 import java.util.UUID;
 import javax.inject.Singleton;
+
 import com.example.cosmos_serversb.entities.*;
 
 @Singleton
 public class Users {
+    private static Users theInstance = null;
+
     private Users() {
     }
-    
+
+    public static Users getInstance() {
+        if (theInstance == null) {
+            theInstance = new Users();
+        }
+        return theInstance;
+    }
+
     public static User createUser(String name, String pw, String iconImage) {
         User testUser = new User("test", "123456789", "http://test.com", "testpw", null, "123456789", "http://iconuri/123456789.com");
-        testUser.token.add(createToken(testUser.uId));
-        testUser.token.add(createToken(testUser.uId));
+        testUser.token.add(getInstance().createToken(testUser.uId));
+        testUser.token.add(getInstance().createToken(testUser.uId));
         return testUser;
     }
 
-    public static String createToken(String uId){
+    public static String createToken(String uId) {
         //Tokenを作成しuIdと関連付けしDBに保存し作成したTokenを返す
         String token = UUID.randomUUID().toString();
         return token;
@@ -23,22 +34,22 @@
 
     public static User setUser(String uId, String name, String pw, String iconImage) {
         User testUser = new User("test", "123456789", "http://test.com", "testpw", null, "123456789", "http://iconuri/123456789.com");
-        testUser.token.add(createToken(testUser.uId));
-        testUser.token.add(createToken(testUser.uId));
+        testUser.token.add(getInstance().createToken(testUser.uId));
+        testUser.token.add(getInstance().createToken(testUser.uId));
         return testUser;
     }
 
     public static User getUserById(String uId) {
         User testUser = new User("test", "123456789", "http://test.com", "testpw", null, "123456789", "http://iconuri/123456789.com");
-        testUser.token.add(createToken(testUser.uId));
-        testUser.token.add(createToken(testUser.uId));
+        testUser.token.add(getInstance().createToken(testUser.uId));
+        testUser.token.add(getInstance().createToken(testUser.uId));
         return testUser;
     }
 
     public static User getUserByToken(String token) {
         User testUser = new User("test", "123456789", "http://test.com", "testpw", null, "123456789", "http://iconuri/123456789.com");
-        testUser.token.add(createToken(testUser.uId));
-        testUser.token.add(createToken(testUser.uId));
+        testUser.token.add(getInstance().createToken(testUser.uId));
+        testUser.token.add(getInstance().createToken(testUser.uId));
         return testUser;
     }
 
@@ -47,7 +58,7 @@
     }
 
     public static String login(String uId) {
-        return createToken(uId);//testToken
+        return getInstance().createToken(uId);//testToken
     }
 
     public static DeleteResult logout(String token) {