diff --git a/app/src/main/java/org/ntlab/amaryllis/client/Amaryllis.java b/app/src/main/java/org/ntlab/amaryllis/client/Amaryllis.java
index 6aa4ab8..2b06546 100644
--- a/app/src/main/java/org/ntlab/amaryllis/client/Amaryllis.java
+++ b/app/src/main/java/org/ntlab/amaryllis/client/Amaryllis.java
@@ -8,6 +8,7 @@
     private String token = null;
     private String uid = null;
     private String password=null;
+    private String name = null;
     private String latitude=null;
     private String longitude=null;
     
@@ -41,6 +42,21 @@
         return password;
     }
 
+    public void setName(String name) {
+        SharedPreferences prefData = getSharedPreferences("pref_data", MODE_PRIVATE);
+        SharedPreferences.Editor editor = prefData.edit();
+        editor.putString("name", name);
+        editor.commit();
+    }
+
+    public String getName() {
+        if(name == null){
+            SharedPreferences prefData = getSharedPreferences("pref_data", MODE_PRIVATE);
+            name = prefData.getString("name", "");
+        }
+        return name;
+    }
+
     public void setToken(String token) {
         SharedPreferences prefData = getSharedPreferences("pref_data", MODE_PRIVATE);
         SharedPreferences.Editor editor = prefData.edit();
diff --git a/app/src/main/java/org/ntlab/amaryllis/client/LoginActivity.java b/app/src/main/java/org/ntlab/amaryllis/client/LoginActivity.java
index d125da9..8b210d4 100644
--- a/app/src/main/java/org/ntlab/amaryllis/client/LoginActivity.java
+++ b/app/src/main/java/org/ntlab/amaryllis/client/LoginActivity.java
@@ -55,7 +55,8 @@
                         app.setToken(signUpJson.getToken());
                         app.setUid(nameText.getText().toString());
                         app.setPassword(passWordEditText.getText().toString());
-                        Intent intent = new Intent(LoginActivity.this, MainActivity.class);
+                        app.setName(nameText.getText().toString());
+                        Intent intent = new Intent(getApplication(), MainActivity.class);
                         startActivity(intent);
                         finish();
                     }
diff --git a/app/src/main/java/org/ntlab/amaryllis/client/MainActivity.java b/app/src/main/java/org/ntlab/amaryllis/client/MainActivity.java
index 0be6295..5c972db 100644
--- a/app/src/main/java/org/ntlab/amaryllis/client/MainActivity.java
+++ b/app/src/main/java/org/ntlab/amaryllis/client/MainActivity.java
@@ -202,10 +202,14 @@
     public void method() {
         Amaryllis amaryllis =(Amaryllis) getApplication();
         amaryllis.setPassword("");
+        amaryllis.setName("");
+        amaryllis.setUid("");
     }
-    public void logout(){
-        Intent intent = new Intent(MainActivity.this, LoginActivity.class);
+
+    public void logout() {
+        Intent intent = new Intent(getApplication(), LoginActivity.class);
         startActivity(intent);
         finish();
     }
+
 }
\ No newline at end of file
diff --git a/app/src/main/java/org/ntlab/amaryllis/client/SignUpActivity.java b/app/src/main/java/org/ntlab/amaryllis/client/SignUpActivity.java
index 7c34b9a..4894894 100644
--- a/app/src/main/java/org/ntlab/amaryllis/client/SignUpActivity.java
+++ b/app/src/main/java/org/ntlab/amaryllis/client/SignUpActivity.java
@@ -7,6 +7,7 @@
 import android.content.Intent;
 import android.os.Bundle;
 import android.text.Editable;
+import android.text.TextUtils;
 import android.text.TextWatcher;
 import android.view.View;
 import android.widget.Button;
@@ -43,9 +44,9 @@
         Amaryllis amaryllis =(Amaryllis) getApplication();
         String uid = amaryllis.getUid();
         String passWord = amaryllis.getPassword();
-        if(uid.length() != 0 && passWord.length() != 0){
+        if(TextUtils.isEmpty(uid) == false && TextUtils.isEmpty(passWord) == false){
             signUpService.accountLogin(uid,passWord);
-            Intent intent = new Intent(SignUpActivity.this, MainActivity.class);
+            Intent intent = new Intent(getApplication(), MainActivity.class);
             startActivity(intent);
             finish();
         }
@@ -76,7 +77,8 @@
                         amaryllis.setToken(token);
                         amaryllis.setUid(signUpJson.getUid());
                         amaryllis.setPassword(passWordEditText.getText().toString());
-                        Intent intent = new Intent(SignUpActivity.this, MainActivity.class);
+                        amaryllis.setName(nameEditText.getText().toString());
+                        Intent intent = new Intent(getApplication(), MainActivity.class);
                         startActivity(intent);
                         finish();
                     }
diff --git a/app/src/main/java/org/ntlab/amaryllis/client/fragment/AccountFragment.java b/app/src/main/java/org/ntlab/amaryllis/client/fragment/AccountFragment.java
index 9597543..95bac7e 100644
--- a/app/src/main/java/org/ntlab/amaryllis/client/fragment/AccountFragment.java
+++ b/app/src/main/java/org/ntlab/amaryllis/client/fragment/AccountFragment.java
@@ -6,10 +6,15 @@
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.fragment.app.Fragment;
+
+import android.text.Editable;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.Button;
+import android.widget.EditText;
+import android.text.TextWatcher;
+import android.widget.TextView;
 
 import org.ntlab.amaryllis.client.Amaryllis;
 import org.ntlab.amaryllis.client.MainActivity;
@@ -30,7 +35,7 @@
  * Use the {@link AccountFragment#newInstance} factory method to
  * create an instance of this fragment.
  */
-public class AccountFragment extends Fragment {
+public class AccountFragment extends Fragment implements TextWatcher{
 
     // TODO: Rename parameter arguments, choose names that match
     // the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
@@ -40,6 +45,11 @@
     // TODO: Rename and change types of parameters
     private String mParam1;
     private String mParam2;
+    TextView nameTextView;
+    EditText nameEditText;
+    TextView introductionTextView;
+    EditText introductionEditText;
+    Button changeButton;
     Button logoutButton;
 
     private static final int READ_REQUEST_CODE = 42;
@@ -80,6 +90,18 @@
                 .baseUrl("http://nitta-lab-www.is.konan-u.ac.jp/amaryllis/")
                 .addConverterFactory(JacksonConverterFactory.create())
                 .build();
+        Amaryllis app =(Amaryllis) getActivity().getApplication();
+        nameEditText = (EditText)view.findViewById(R.id.name);
+        nameEditText.addTextChangedListener(this);
+        nameTextView = view.findViewById(R.id.name);
+        String name = app.getName();
+        nameEditText.setText(name);
+        introductionEditText =(EditText)view.findViewById(R.id.introduction);
+        introductionEditText.addTextChangedListener(this);
+        introductionTextView = view.findViewById(R.id.introduction);
+        introductionEditText.setEnabled(false);
+        changeButton = (Button)view.findViewById(R.id.change);
+        changeButton.setEnabled(true);
         logoutButton = (Button)view.findViewById(R.id.logout);
         logoutButton.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
@@ -87,9 +109,8 @@
                 ma.method();
                 ma.logout();
             }
-            });
-
-    }
+     });
+        }
 
     @Override
     public View onCreateView(LayoutInflater inflater, ViewGroup container,
@@ -98,4 +119,22 @@
 
         return inflater.inflate(R.layout.fragment_account, container, false);
     }
+
+    @Override
+    public void beforeTextChanged(CharSequence s, int start, int count, int after) {
+
+    }
+
+    @Override
+    public void onTextChanged(CharSequence s, int start, int before, int count) {
+
+    }
+
+    @Override
+    public void afterTextChanged(Editable s) {
+        if(nameTextView.length() == 0 && introductionTextView.length() == 0){
+            changeButton.setEnabled(false);
+        }
+
+    }
 }
\ No newline at end of file
diff --git a/app/src/main/res/layout/fragment_account.xml b/app/src/main/res/layout/fragment_account.xml
index f3b801b..b295566 100644
--- a/app/src/main/res/layout/fragment_account.xml
+++ b/app/src/main/res/layout/fragment_account.xml
@@ -12,7 +12,7 @@
 
 
     <Button
-        android:id="@+id/button3"
+        android:id="@+id/change"
         android:layout_width="61dp"
         android:layout_height="37dp"
         android:text="変更"
@@ -24,7 +24,7 @@
         app:layout_constraintVertical_bias="0.417" />
 
     <EditText
-        android:id="@+id/editTextTextPersonName"
+        android:id="@+id/name"
         android:layout_width="177dp"
         android:layout_height="37dp"
         android:ems="10"
@@ -39,13 +39,13 @@
         app:layout_constraintVertical_bias="0.115" />
 
     <EditText
-        android:id="@+id/editTextTextPersonName2"
+        android:id="@+id/introduction"
         android:layout_width="345dp"
         android:layout_height="125dp"
         android:ems="10"
         android:gravity="left"
         android:inputType="textMultiLine|textPersonName"
-        android:text="Name"
+        android:text="自己紹介"
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintHorizontal_bias="0.242"