diff --git a/app/src/main/java/com/example/cosmosclient/resources/UsersRest.java b/app/src/main/java/com/example/cosmosclient/resources/UsersRest.java
index 205b4a2..608b4f8 100644
--- a/app/src/main/java/com/example/cosmosclient/resources/UsersRest.java
+++ b/app/src/main/java/com/example/cosmosclient/resources/UsersRest.java
@@ -17,5 +17,5 @@
 
     @POST("users")
     @FormUrlEncoded
-    Call<SignupResponse> createUser(@Field("name") String name, @Field("pw") String pw, @Field("icon-image") String icon_image);
+    Call<SignupResponse> createUser(@Field("name") String name, @Field("pw") String pw, @Field("iconImage") String icon_image);
 }
diff --git a/app/src/main/java/com/example/cosmosclient/views/MemberListActivity.java b/app/src/main/java/com/example/cosmosclient/views/MemberListActivity.java
index d757753..d2ab01a 100644
--- a/app/src/main/java/com/example/cosmosclient/views/MemberListActivity.java
+++ b/app/src/main/java/com/example/cosmosclient/views/MemberListActivity.java
@@ -138,4 +138,4 @@
             }
         });
     }
-}
+}
\ No newline at end of file
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 f449c15..5770dcc 100644
--- a/app/src/main/java/com/example/cosmosclient/views/SignupActivity.java
+++ b/app/src/main/java/com/example/cosmosclient/views/SignupActivity.java
@@ -40,7 +40,7 @@
     private boolean cpwEnable;
     private Button MakeAccountButton;
     private ImageView iconChoice;
-    private String iconImageBase64 = null;
+    private String iconImageBase64;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
@@ -176,7 +176,7 @@
             if (resultCode == RESULT_OK) {
                 Uri resultUri = result.getUri();
                 //画面にトリミングした画像をセット
-                iconChoice.setImageURI(resultUri);
+                //iconChoice.setImageURI(resultUri);
 
                 try {
                     //UriからBitmapの取得
@@ -184,10 +184,19 @@
 
                     //画像をBase64に変換
                     ByteArrayOutputStream baos = new ByteArrayOutputStream();
-                    image.compress(Bitmap.CompressFormat.JPEG,100, baos);
+                    Bitmap afterResizeBitmap = Bitmap.createScaledBitmap(image,50,50,true);
+                    afterResizeBitmap.compress(Bitmap.CompressFormat.JPEG,70, baos);
+
                     byte[] b = baos.toByteArray();
                     String imageEncoded = Base64.encodeToString(b, Base64.DEFAULT);
-                    iconImageBase64 = imageEncoded;
+
+                    if(imageEncoded.length() <= 2000){
+                        iconChoice.setImageBitmap(image);
+                        iconImageBase64 = imageEncoded;
+                    }else{
+                        Toast.makeText(SignupActivity.this,
+                                "この画像は使用できません。\n別の画像を選択してください。",Toast.LENGTH_LONG).show();
+                    }
                 }catch(IOException e){
                     e.printStackTrace();
                 }