diff --git a/app/src/main/java/com/example/cosmosclient/views/CreateGroupActivity.java b/app/src/main/java/com/example/cosmosclient/views/CreateGroupActivity.java
index d83bf9e..605afc8 100644
--- a/app/src/main/java/com/example/cosmosclient/views/CreateGroupActivity.java
+++ b/app/src/main/java/com/example/cosmosclient/views/CreateGroupActivity.java
@@ -1,10 +1,14 @@
 package com.example.cosmosclient.views;
 
+import android.media.Image;
 import android.support.v7.app.AppCompatActivity;
 import android.os.Bundle;
+import android.text.Editable;
+import android.text.TextWatcher;
 import android.view.View;
 import android.widget.Button;
 import android.widget.EditText;
+import android.widget.ImageButton;
 import android.widget.Toast;
 
 import com.example.cosmosclient.R;
@@ -19,6 +23,7 @@
 import retrofit2.converter.jackson.JacksonConverterFactory;
 
 public class CreateGroupActivity extends AppCompatActivity {
+    Button createGroupButton;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
@@ -27,9 +32,14 @@
 
         //各種IDを取得
         final EditText groupNameText = findViewById(R.id.groupNameText);
-        Button createGroupButton = findViewById(R.id.createGroupButton);
+        createGroupButton = findViewById(R.id.createGroupButton);
         final String uId,token;
 
+        //ボタン有効化＆監視
+        createGroupButton.setEnabled(false);
+        createGroupButton.setBackgroundColor(0xaa808080);
+        groupNameText.addTextChangedListener(new CreateGroupActivity.GenericTextWatcher(groupNameText));
+
         //グループ作成に必要な情報の取得
         Cosmos app = (Cosmos) getApplication();
         uId = app.getuId();
@@ -90,4 +100,29 @@
             }
         });
     }
-}
+    //テキスト欄監視
+    private class GenericTextWatcher implements TextWatcher {
+        private View view;
+
+        private GenericTextWatcher(View view){
+            this.view = view;
+        }
+
+        @Override
+        public  void beforeTextChanged(CharSequence s, int start, int count,int after){/*記述不要*/};
+        @Override
+        public void onTextChanged(CharSequence s, int start, int before, int count){/*記述不要*/};
+
+        @Override
+        public void afterTextChanged(Editable s){
+            //ボタン有効＆無効
+            if(s.length()>0){
+                createGroupButton.setEnabled(true);
+                createGroupButton.setBackgroundColor(0xaa009688);
+            }else{
+                createGroupButton.setEnabled(false);
+                createGroupButton.setBackgroundColor(0xaa808080);
+            }
+        }
+    }
+}
\ No newline at end of file