diff --git a/app/src/main/java/com/example/cosmosclient/views/GroupListActivity.java b/app/src/main/java/com/example/cosmosclient/views/GroupListActivity.java
index 08b6688..0ff3b5b 100644
--- a/app/src/main/java/com/example/cosmosclient/views/GroupListActivity.java
+++ b/app/src/main/java/com/example/cosmosclient/views/GroupListActivity.java
@@ -1,6 +1,7 @@
 package com.example.cosmosclient.views;
 
 import android.content.Intent;
+import android.content.SharedPreferences;
 import android.graphics.Bitmap;
 import android.graphics.BitmapFactory;
 import android.nfc.Tag;
@@ -345,6 +346,11 @@
             Intent intent=new Intent(GroupListActivity.this, com.example.cosmosclient.views.JoinGroupActionsActivity.class);
             startActivity(intent);
         } else if (id == R.id.signOutButton){
+            //トークン削除
+            SharedPreferences prefData = getSharedPreferences("pref_data", MODE_PRIVATE);
+            SharedPreferences.Editor editor = prefData.edit();
+            editor.remove("token");
+            editor.commit();
             gridView.stopEditMode();
             Intent intent=new Intent(GroupListActivity.this, com.example.cosmosclient.views.SigninActivity.class);
             ActivityCompat.finishAffinity(GroupListActivity.this);
diff --git a/app/src/main/java/com/example/cosmosclient/views/SigninActivity.java b/app/src/main/java/com/example/cosmosclient/views/SigninActivity.java
index f1cd4e9..400555d 100644
--- a/app/src/main/java/com/example/cosmosclient/views/SigninActivity.java
+++ b/app/src/main/java/com/example/cosmosclient/views/SigninActivity.java
@@ -133,6 +133,13 @@
                                 app.setToken(result.token);
                                 app.setuId(UserIdText.getText().toString());
 
+                                //SharedPreferencesに情報保存
+                                SharedPreferences prefData = getSharedPreferences("pref_data", MODE_PRIVATE);
+                                SharedPreferences.Editor editor = prefData.edit();
+                                editor.putString("account", UserIdText.getText().toString());
+                                editor.putString("token", result.token);
+                                editor.commit();
+
                                 //画面遷移
                                 Intent intent = new Intent(getApplication(), GroupListActivity.class);
                                 startActivity(intent);
diff --git a/app/src/main/java/com/example/cosmosclient/views/SignupActivity.java b/app/src/main/java/com/example/cosmosclient/views/SignupActivity.java
index 32a05c0..afa76b9 100644
--- a/app/src/main/java/com/example/cosmosclient/views/SignupActivity.java
+++ b/app/src/main/java/com/example/cosmosclient/views/SignupActivity.java
@@ -112,6 +112,7 @@
                             Cosmos app = (Cosmos) getApplication();
                             app.setToken(result.token);
                             app.setuId(result.uId);
+                            //データをprerefarenceに保存
 
                             // 「pref_data」という設定データファイルを読み込み
                             SharedPreferences prefData = getSharedPreferences("pref_data", MODE_PRIVATE);
@@ -119,6 +120,7 @@
 
                             // 入力されたログインIDとログインパスワード
                             editor.putString("account", result.uId);
+                            editor.putString("token", result.token);
 
                             // 保存
                             editor.commit();