diff --git a/app/src/main/java/com/example/sprout/refactor/repository/RegistrationRepository.java b/app/src/main/java/com/example/sprout/refactor/repository/RegistrationRepository.java
index 0f41a14..16ae86f 100644
--- a/app/src/main/java/com/example/sprout/refactor/repository/RegistrationRepository.java
+++ b/app/src/main/java/com/example/sprout/refactor/repository/RegistrationRepository.java
@@ -20,6 +20,7 @@
 
     private RegistrationService registrationService = null;
     private Subject<Account> registrationSubject = PublishSubject.<Account>create().toSerialized();
+    private Subject<Throwable> registrationErrorSubject = PublishSubject.<Throwable>create().toSerialized();
 
     public RegistrationRepository() {
         this.registrationService = new Retrofit
@@ -46,12 +47,16 @@
                             registrationSubject.onNext(account);
                         },
                         error -> {
-                            System.out.println("error");
-                            // TODO:error handling
+                            System.out.println("hogehoge");
+                            registrationErrorSubject.onNext(error);
                         });
     }
 
     public Observable<Account> getRegistrationObservable() {
         return registrationSubject.hide();
     }
+
+    public Observable<Throwable> getRegistrationErrorObservable() {
+        return registrationErrorSubject.hide();
+    }
 }
\ No newline at end of file