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 605afc8..14e774e 100644
--- a/app/src/main/java/com/example/cosmosclient/views/CreateGroupActivity.java
+++ b/app/src/main/java/com/example/cosmosclient/views/CreateGroupActivity.java
@@ -1,6 +1,7 @@
 package com.example.cosmosclient.views;
 
 import android.media.Image;
+import android.os.Handler;
 import android.support.v7.app.AppCompatActivity;
 import android.os.Bundle;
 import android.text.Editable;
@@ -59,6 +60,14 @@
         createGroupButton.setOnClickListener(new View.OnClickListener(){
             @Override
             public void onClick(View view){
+                //ボタン連打防止
+                createGroupButton.setEnabled(false);
+                new Handler().postDelayed(new Runnable() {
+                    public void run() {
+                        createGroupButton.setEnabled(true);
+                    }
+                }, 1000L);
+
                 try {
                     Call<Group> createGroup = createGroupService.createGroup(groupNameText.getText().toString(), uId, token);
 
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 7214bb7..799fec0 100644
--- a/app/src/main/java/com/example/cosmosclient/views/SigninActivity.java
+++ b/app/src/main/java/com/example/cosmosclient/views/SigninActivity.java
@@ -1,6 +1,7 @@
 package com.example.cosmosclient.views;
 
 import android.content.Intent;
+import android.os.Handler;
 import android.support.v7.app.AppCompatActivity;
 import android.os.Bundle;
 import android.text.Editable;
@@ -57,6 +58,14 @@
         SigninButton.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
+                //ボタン連打防止
+                SigninButton.setEnabled(false);
+                new Handler().postDelayed(new Runnable() {
+                    public void run() {
+                        SigninButton.setEnabled(true);
+                    }
+                }, 1000L);
+
                 //APIに値を送信
                 Call<SigninResponse> call = signinService.login(UserIdText.getText().toString(), PasswordText.getText().toString());
 
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 fe6d66f..da8b756 100644
--- a/app/src/main/java/com/example/cosmosclient/views/SignupActivity.java
+++ b/app/src/main/java/com/example/cosmosclient/views/SignupActivity.java
@@ -3,6 +3,7 @@
 
 import android.content.Intent;
 import android.net.Uri;
+import android.os.Handler;
 import android.support.v7.app.AppCompatActivity;
 import android.os.Bundle;
 import android.text.Editable;
@@ -68,6 +69,15 @@
         MakeAccountButton.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
+                //ボタン連打防止
+                MakeAccountButton.setEnabled(false);
+                new Handler().postDelayed(new Runnable() {
+                    public void run() {
+                        MakeAccountButton.setEnabled(true);
+                    }
+                }, 1000L);
+
+                //パスワード文字列比較のための変数宣言
                 String pw = PasswordText.getText().toString();
                 String confirmPw = ConfirmPasswordText.getText().toString();