diff --git a/src/main/java/org/ntlab/citrusserver/resources/FavoritedRest.java b/src/main/java/org/ntlab/citrusserver/resources/FavoritedRest.java
index 28428b3..f08a467 100644
--- a/src/main/java/org/ntlab/citrusserver/resources/FavoritedRest.java
+++ b/src/main/java/org/ntlab/citrusserver/resources/FavoritedRest.java
@@ -41,18 +41,33 @@
     @PUT
     @Produces(MediaType.APPLICATION_FORM_URLENCODED)
     public void putFavorited(@PathParam("account_id") String account_id, @PathParam("book_id") Integer book_id, @PathParam("other_account_id") String other_account_id, @FormParam("token") String token){
+
+        //accountID存在確認
         if(accountManager.getAccount(account_id) != null) {
+            //other_account_id存在確認
             if(accountManager.getAccount(other_account_id) != null){
-                if (accountManager.checkToken(other_account_id, token)) {
-                    if (bookManager.getBook(account_id, book_id) != null) {
+                //book_id存在確認
+                if (bookManager.getBook(account_id, book_id) != null) {
+                    //token認証
+                    if (accountManager.checkToken(other_account_id, token)) {
                         favoriteManager.putFavorited(account_id, book_id, other_account_id);
                         favoriteManager.putFavorites(other_account_id, account_id, book_id);//変更点（要検討）
                     } else {
+                        //tokne認証失敗時のエラー表示
                         var response = Response.status(Response.Status.FORBIDDEN).entity("認証失敗");
                         throw new WebApplicationException(response.build());
                     }
+                    //本が存在しない時に対するエラー表示
+                    var response = Response.status(Response.Status.NOT_FOUND).entity("本が存在しません");
+                    throw new WebApplicationException(response.build());
                 }
+                //other_account_idが存在しない時に対するエラー表示
+                var response = Response.status(Response.Status.NOT_FOUND).entity("accountが存在しません");
+                throw new WebApplicationException(response.build());
             }
+            //account_idが存在しない時に対するエラー表示
+            var response = Response.status(Response.Status.NOT_FOUND).entity("accountが存在しません");
+            throw new WebApplicationException(response.build());
         }
 
     }
@@ -61,18 +76,32 @@
     @DELETE
     @Produces(MediaType.APPLICATION_FORM_URLENCODED)
     public void removeFavorited(@PathParam("account_id") String account_id, @PathParam("book_id") Integer book_id, @PathParam("other_account_id") String other_account_id, @QueryParam("token") String token){
+       //account存在確認
         if(accountManager.getAccount(account_id) != null){
+            //other_account_id存在確認
             if(accountManager.getAccount(other_account_id) != null){
-                if(accountManager.checkToken(other_account_id,token)) {
-                    if(bookManager.getBook(account_id,book_id) != null){
+                //book_id存在確認
+                if(bookManager.getBook(account_id,book_id) != null){
+                    //token承認
+                    if(accountManager.checkToken(other_account_id,token)) {
                         favoriteManager.removeFavorited(account_id, book_id, other_account_id);
                         favoriteManager.removeFavorites(other_account_id, account_id, book_id);//変更点（要検討）
                     }else{
+                        //tokenが承認しないときに対するエラー表示
                         var response = Response.status(Response.Status.FORBIDDEN).entity("認証失敗");
                         throw new WebApplicationException(response.build());
                     }
+                    //本が存在しない時に対するエラー表示
+                    var response = Response.status(Response.Status.NOT_FOUND).entity("本が存在しません");
+                    throw new WebApplicationException(response.build());
                 }
+                //other_account_idが存在しない時に対するエラー表示
+                var response = Response.status(Response.Status.NOT_FOUND).entity("accountが存在しません");
+                throw new WebApplicationException(response.build());
             }
+            //accountが存在しない時に対するエラー表示
+            var response = Response.status(Response.Status.NOT_FOUND).entity("accountが存在しません");
+            throw new WebApplicationException(response.build());
         }
     }
 }