diff --git a/app/src/main/java/org/ntlab/irisclient/MemberListAdapter.java b/app/src/main/java/org/ntlab/irisclient/MemberListAdapter.java
index eee7e44..d1092f7 100644
--- a/app/src/main/java/org/ntlab/irisclient/MemberListAdapter.java
+++ b/app/src/main/java/org/ntlab/irisclient/MemberListAdapter.java
@@ -6,6 +6,7 @@
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.ArrayAdapter;
+import android.widget.ImageView;
 import android.widget.TextView;
 
 import org.ntlab.irisclient.models.Member;
@@ -17,6 +18,7 @@
 
     static class ViewHolder {
         TextView textView;
+        ImageView imageView;
     }
     private LayoutInflater inflater;
     private final int itemLayoutId;
@@ -52,6 +54,7 @@
             // ViewHolder を生成
             holder = new ViewHolder();
             holder.textView = convertView.findViewById(R.id.textView);
+            holder.imageView = convertView.findViewById(R.id.star);
 
             convertView.setTag(holder);
 
@@ -79,6 +82,16 @@
                 convertView.setBackgroundColor(grayColor);
             }
 
+
+            holder.imageView.setVisibility(View.GONE);
+            for(int i = 0 ; i < dcList.size();i++){
+                if(dcList.get(i).getMaster()) {
+                    holder.imageView.setVisibility(View.VISIBLE);
+                }else{
+                    holder.imageView.setVisibility(View.GONE);
+                }
+            }
+
         }
         else {
             holder = (ViewHolder) convertView.getTag();
diff --git a/app/src/main/java/org/ntlab/irisclient/OwnerRoomActivity.java b/app/src/main/java/org/ntlab/irisclient/OwnerRoomActivity.java
index c39bae3..79cca26 100644
--- a/app/src/main/java/org/ntlab/irisclient/OwnerRoomActivity.java
+++ b/app/src/main/java/org/ntlab/irisclient/OwnerRoomActivity.java
@@ -156,13 +156,7 @@
         randomButton.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
-
-                Retrofit retrofit = new Retrofit.Builder()
-                        .baseUrl("http://nitta-lab-www.is.konan-u.ac.jp/iris/")
-                        .addConverterFactory(JacksonConverterFactory.create())
-                        .build();
-                final RoomsRest roomsRest = retrofit.create(RoomsRest.class);
-
+                roomViewModel.randomTeam(roomId,myName);
             }
         });
 
diff --git a/app/src/main/res/drawable/star.png b/app/src/main/res/drawable/star.png
new file mode 100644
index 0000000..8a04eea
--- /dev/null
+++ b/app/src/main/res/drawable/star.png
Binary files differ
diff --git a/app/src/main/res/layout/activity_owner_room.xml b/app/src/main/res/layout/activity_owner_room.xml
index 78046f0..d3df172 100644
--- a/app/src/main/res/layout/activity_owner_room.xml
+++ b/app/src/main/res/layout/activity_owner_room.xml
@@ -60,6 +60,7 @@
         android:layout_width="295dp"
         android:layout_height="370dp"
         android:layout_marginEnd="24dp"
+        android:visibility="visible"
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintEnd_toStartOf="@+id/beBlueMaster"
         app:layout_constraintHorizontal_bias="0.961"
diff --git a/app/src/main/res/layout/member_list_layout.xml b/app/src/main/res/layout/member_list_layout.xml
index 9aaf809..e65f4c1 100644
--- a/app/src/main/res/layout/member_list_layout.xml
+++ b/app/src/main/res/layout/member_list_layout.xml
@@ -1,18 +1,29 @@
 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
-    android:orientation="horizontal"
-    android:gravity="center_vertical"
+    xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
-    android:layout_height="match_parent">
+    android:layout_height="match_parent"
+    android:gravity="center_vertical"
+    android:orientation="horizontal"
+    android:visibility="visible"
+    tools:visibility="visible">
 
-<TextView android:id="@+id/textView"
+    <ImageView
+        android:id="@+id/star"
+        android:layout_width="25dp"
+        android:layout_height="25dp"
+        android:src="@drawable/star"
+        android:visibility="visible"
+        tools:visibility="visible"/>
 
-    android:layout_width="wrap_content"
-    android:layout_height="wrap_content"
-    android:textSize="25sp"
-    android:textColor="#000"
-    xmlns:android="http://schemas.android.com/apk/res/android">
+    <TextView
+        android:id="@+id/textView"
 
-</TextView>
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:textColor="#000"
+        android:textSize="25sp">
+
+    </TextView>
 
 </LinearLayout>