diff --git a/app/src/main/java/com/example/cosmosclient/views/GroupList.java b/app/src/main/java/com/example/cosmosclient/views/GroupList.java
index b512f02..30f6f2a 100644
--- a/app/src/main/java/com/example/cosmosclient/views/GroupList.java
+++ b/app/src/main/java/com/example/cosmosclient/views/GroupList.java
@@ -28,7 +28,7 @@
         Toolbar toolbar = findViewById(R.id.toolbar);
         setSupportActionBar(toolbar);
 
-        /*とりあえずの画面遷移なので変更するかも*/
+        /* とりあえずの画面遷移なので変更するかも */
         TextView group1 = findViewById(R.id.group1);
         group1.setOnClickListener(new View.OnClickListener() {
             @Override
@@ -38,6 +38,7 @@
             }
         });
 
+
         DrawerLayout drawer = findViewById(R.id.drawer_layout);
         NavigationView navigationView = findViewById(R.id.nav_view);
         ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
@@ -82,10 +83,18 @@
     @SuppressWarnings("StatementWithEmptyBody")
     @Override
     public boolean onNavigationItemSelected(MenuItem item) {
+
+
         // Handle navigation view item clicks here.
         int id = item.getItemId();
         if ( id == R.id.createNewGroupButton){
 
+        } else if (id == R.id.joinGroupButton){
+            //Intent intent=new Intent(GroupList.this, com.example.cosmosclient.views.QRcodeReadingActivity.class);
+            //startActivity(intent);
+        } else if (id == R.id.signOutButton){
+            Intent intent=new Intent(GroupList.this, com.example.cosmosclient.views.SigninActivity.class);
+            startActivity(intent);
         }
 /*
         if (id == R.id.nav_home) {
diff --git a/app/src/main/res/drawable/ic_arrow_back_black_24dp.xml b/app/src/main/res/drawable/ic_arrow_back_black_24dp.xml
new file mode 100644
index 0000000..beafea3
--- /dev/null
+++ b/app/src/main/res/drawable/ic_arrow_back_black_24dp.xml
@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportWidth="24.0"
+        android:viewportHeight="24.0">
+    <path
+        android:fillColor="#FF000000"
+        android:pathData="M20,11H7.83l5.59,-5.59L12,4l-8,8 8,8 1.41,-1.41L7.83,13H20v-2z"/>
+</vector>
diff --git a/app/src/main/res/drawable/ic_group_add_black_24dp.xml b/app/src/main/res/drawable/ic_group_add_black_24dp.xml
new file mode 100644
index 0000000..b3a2fb3
--- /dev/null
+++ b/app/src/main/res/drawable/ic_group_add_black_24dp.xml
@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportWidth="24.0"
+        android:viewportHeight="24.0">
+    <path
+        android:fillColor="#FF000000"
+        android:pathData="M8,10L5,10L5,7L3,7v3L0,10v2h3v3h2v-3h3v-2zM18,11c1.66,0 2.99,-1.34 2.99,-3S19.66,5 18,5c-0.32,0 -0.63,0.05 -0.91,0.14 0.57,0.81 0.9,1.79 0.9,2.86s-0.34,2.04 -0.9,2.86c0.28,0.09 0.59,0.14 0.91,0.14zM13,11c1.66,0 2.99,-1.34 2.99,-3S14.66,5 13,5c-1.66,0 -3,1.34 -3,3s1.34,3 3,3zM19.62,13.16c0.83,0.73 1.38,1.66 1.38,2.84v2h3v-2c0,-1.54 -2.37,-2.49 -4.38,-2.84zM13,13c-2,0 -6,1 -6,3v2h12v-2c0,-2 -4,-3 -6,-3z"/>
+</vector>
diff --git a/app/src/main/res/drawable/ic_group_black_24dp.xml b/app/src/main/res/drawable/ic_group_black_24dp.xml
new file mode 100644
index 0000000..4cfd869
--- /dev/null
+++ b/app/src/main/res/drawable/ic_group_black_24dp.xml
@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportWidth="24.0"
+        android:viewportHeight="24.0">
+    <path
+        android:fillColor="#FF000000"
+        android:pathData="M16,11c1.66,0 2.99,-1.34 2.99,-3S17.66,5 16,5c-1.66,0 -3,1.34 -3,3s1.34,3 3,3zM8,11c1.66,0 2.99,-1.34 2.99,-3S9.66,5 8,5C6.34,5 5,6.34 5,8s1.34,3 3,3zM8,13c-2.33,0 -7,1.17 -7,3.5L1,19h14v-2.5c0,-2.33 -4.67,-3.5 -7,-3.5zM16,13c-0.29,0 -0.62,0.02 -0.97,0.05 1.16,0.84 1.97,1.97 1.97,3.45L17,19h6v-2.5c0,-2.33 -4.67,-3.5 -7,-3.5z"/>
+</vector>
diff --git a/app/src/main/res/layout/content_group_list.xml b/app/src/main/res/layout/content_group_list.xml
index 0cd1e28..f5435db 100644
--- a/app/src/main/res/layout/content_group_list.xml
+++ b/app/src/main/res/layout/content_group_list.xml
@@ -10,17 +10,23 @@
 
     <GridView
         android:id="@+id/GroupList"
-        android:layout_width="419dp"
-        android:layout_height="234dp"
-        android:layout_marginStart="8dp"
-        android:layout_marginLeft="8dp"
-        android:layout_marginEnd="8dp"
-        android:layout_marginRight="8dp"
+        android:layout_width="0dp"
+        android:layout_height="400dp"
+        android:layout_marginStart="32dp"
+        android:layout_marginLeft="32dp"
+        android:layout_marginTop="8dp"
+        android:layout_marginEnd="32dp"
+        android:layout_marginRight="32dp"
+        android:layout_marginBottom="4dp"
+        android:background="#FBFCC3"
         android:numColumns="2"
+        android:verticalSpacing="20dp"
         android:visibility="invisible"
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintStart_toStartOf="parent" />
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/group1"
+        app:layout_constraintVertical_bias="1.0" />
 
     <TextView
         android:id="@+id/group1"
diff --git a/app/src/main/res/menu/activity_group_list_drawer.xml b/app/src/main/res/menu/activity_group_list_drawer.xml
index 45f9007..2b49b0f 100644
--- a/app/src/main/res/menu/activity_group_list_drawer.xml
+++ b/app/src/main/res/menu/activity_group_list_drawer.xml
@@ -41,7 +41,15 @@
     </item>
     <item
         android:id="@+id/createNewGroupButton"
-        android:icon="@drawable/ic_add_circle_black_24dp"
+        android:icon="@drawable/ic_group_add_black_24dp"
         android:title="新規グループ作成" />
+    <item
+        android:id="@+id/joinGroupButton"
+        android:icon="@drawable/ic_group_black_24dp"
+        android:title="グループに入る" />
+    <item
+        android:id="@+id/signOutButton"
+        android:icon="@drawable/ic_arrow_back_black_24dp"
+        android:title="サインアウト" />
 
 </menu>