diff --git a/app/src/main/java/com/example/citrusclient/rest/BooksRest.java b/app/src/main/java/com/example/citrusclient/rest/BooksRest.java
index 47ba3ef..420da7f 100644
--- a/app/src/main/java/com/example/citrusclient/rest/BooksRest.java
+++ b/app/src/main/java/com/example/citrusclient/rest/BooksRest.java
@@ -28,7 +28,7 @@
     //本の新規作成
     @FormUrlEncoded
     @POST("accounts/{account_id}/books")
-    Call<Book> createBook(
+    Call<HashMap<Integer, Book>> createBook(
             @Path("account_id") String account_id,
             @Field("title") String title,
             @Field("color") String color,
@@ -46,7 +46,7 @@
 
     //本の削除
     @DELETE("accounts/{account_id}/books/{book_id}")
-    Call<String> deleteBook(
+    Call<HashMap<Integer, Book>> deleteBook(
             @Path("account_id") String account_id,
             @Path("book_id") Integer book_id,
             @Query("token") String token