diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index e3c386a..56c3abd 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -11,6 +11,7 @@
         android:theme="@style/Theme.IrisClient">
         <activity
             android:name=".MainActivity"
+            android:screenOrientation="landscape"
             android:exported="true">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
@@ -19,6 +20,11 @@
             </intent-filter>
         </activity>
         <activity
+            android:name=".EnterRoomActivity"
+            android:exported="true"
+            android:screenOrientation="landscape" >
+        </activity>
+        <activity
             android:name=".CreateRoomActivity"
             android:screenOrientation="landscape"
             android:exported="true" >
diff --git a/app/src/main/java/org/ntlab/irisclient/EnterRoomActivity.java b/app/src/main/java/org/ntlab/irisclient/EnterRoomActivity.java
new file mode 100644
index 0000000..19d8314
--- /dev/null
+++ b/app/src/main/java/org/ntlab/irisclient/EnterRoomActivity.java
@@ -0,0 +1,21 @@
+package org.ntlab.irisclient;
+
+import androidx.appcompat.app.ActionBar;
+import androidx.appcompat.app.AppCompatActivity;
+
+import android.os.Bundle;
+
+public class EnterRoomActivity extends AppCompatActivity {
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_enter_room);
+
+        ActionBar actionBar = getSupportActionBar();
+        if(actionBar != null) {
+            actionBar.hide();
+        }
+
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/org/ntlab/irisclient/MainActivity.java b/app/src/main/java/org/ntlab/irisclient/MainActivity.java
index 9a29cff..fd1080f 100644
--- a/app/src/main/java/org/ntlab/irisclient/MainActivity.java
+++ b/app/src/main/java/org/ntlab/irisclient/MainActivity.java
@@ -3,7 +3,10 @@
 import androidx.appcompat.app.ActionBar;
 import androidx.appcompat.app.AppCompatActivity;
 
+import android.content.Intent;
 import android.os.Bundle;
+import android.view.View;
+import android.widget.Button;
 
 public class MainActivity extends AppCompatActivity {
 
@@ -12,6 +15,19 @@
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
 
-        
+        ActionBar actionBar = getSupportActionBar();
+        if(actionBar != null) {
+            actionBar.hide();
+        }
+
+        Button entryButton =(Button)findViewById(R.id.entry_room);
+        entryButton.setOnClickListener(new View.OnClickListener() {
+            public void onClick(View v){
+                Intent intent = new Intent(MainActivity.this,EnterRoomActivity.class);
+                startActivity(intent);
+            }
+        });
+
+
     }
 }
\ No newline at end of file
diff --git a/app/src/main/res/layout/activity_enter_room.xml b/app/src/main/res/layout/activity_enter_room.xml
new file mode 100644
index 0000000..cbbf45e
--- /dev/null
+++ b/app/src/main/res/layout/activity_enter_room.xml
@@ -0,0 +1,77 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".EnterRoomActivity">
+
+    <Button
+        android:id="@+id/EntryRoomButton"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="ルームに入る"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintHorizontal_bias="0.499"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintVertical_bias="0.873" />
+
+
+    <TextView
+        android:id="@+id/nicknameTextView"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="ルームに入る前に、あなたのニックネームを設定してください"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintVertical_bias="0.125" />
+
+    <EditText
+        android:id="@+id/nicknameEditText"
+        android:layout_width="279dp"
+        android:layout_height="54dp"
+        android:ems="10"
+        android:gravity="center"
+        android:hint="ニックネームを入力してください"
+        android:inputType="textPersonName"
+        android:maxLength="15"
+        android:maxLines="1"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/nicknameTextView"
+        app:layout_constraintVertical_bias="0.084" />
+
+    <TextView
+        android:id="@+id/roomidTextView"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="部屋番号を入力してください"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintHorizontal_bias="0.499"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintVertical_bias="0.461" />
+
+    <EditText
+        android:id="@+id/roomidEditText"
+        android:layout_width="279dp"
+        android:layout_height="54dp"
+        android:ems="10"
+        android:gravity="center"
+        android:hint="部屋番号を入力してください"
+        android:inputType="text"
+        android:maxLength="40"
+        android:maxLines="1"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/roomidTextView"
+        app:layout_constraintVertical_bias="0.172" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file