diff --git a/src/main/java/org/ntlab/citrusserver/repositories/BookManager.java b/src/main/java/org/ntlab/citrusserver/repositories/BookManager.java
index bf694a3..cc72b26 100644
--- a/src/main/java/org/ntlab/citrusserver/repositories/BookManager.java
+++ b/src/main/java/org/ntlab/citrusserver/repositories/BookManager.java
@@ -11,6 +11,7 @@
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
+import java.util.Objects;
 
 @Repository
 public class BookManager {
@@ -44,7 +45,11 @@
         }
         Account account = accountManager.getAccount(accountId); //アカウントの取得
         int newBookId = account.getNewBookId(); //新たに生成されたIdを取得（作成数もここで加算している）
-        Book book = new Book(accountId, newBookId, title, publicity, color, getDateTime()); //本の初期化
+        String setTitle = title;
+        String setColor = color;
+        if(Objects.equals(title, "")) setTitle = "無名の本";
+        if(Objects.equals(color, "")) setColor = "#000000";
+        Book book = new Book(accountId, newBookId, setTitle, publicity, setColor, getDateTime()); //本の初期化
         notifyChangedListener(account, book);//公開設定を通知します
         booksMap.get(accountId).put(newBookId, book); //ブックに追加
         return booksMap.get(accountId).get(newBookId);  //（int->Bookを返すように変更した）
@@ -77,7 +82,9 @@
     //本のタイトルを変更
     public void putTitle(String accountId, Integer bookId, String title)
     {
-            booksMap.get(accountId).get(bookId).setTitle(title);
+        String setTitle = title;
+        if(Objects.equals(title, "")) setTitle = "無名の本";
+        booksMap.get(accountId).get(bookId).setTitle(setTitle);
     }
 
     //本の公開情報を返す