diff --git a/src/main/java/org/ntlab/citrusserver/repositories/TodoManager.java b/src/main/java/org/ntlab/citrusserver/repositories/TodoManager.java
index 38d8fa5..76399d1 100644
--- a/src/main/java/org/ntlab/citrusserver/repositories/TodoManager.java
+++ b/src/main/java/org/ntlab/citrusserver/repositories/TodoManager.java
@@ -1,7 +1,9 @@
 package org.ntlab.citrusserver.repositories;
 
 import org.ntlab.citrusserver.entities.Todo;
+import org.springframework.http.HttpStatus;
 import org.springframework.stereotype.Repository;
+import org.springframework.web.server.ResponseStatusException;
 
 import java.util.HashMap;
 
@@ -17,14 +19,19 @@
             HashMap<Integer, //month
             HashMap<Integer, //day
             HashMap<Integer, //todo_id
-                    Todo>>>>>> todos
-            = new HashMap<>();
+                    Todo>>>>>> todos = new HashMap<>();
 
     /**
      * アカウントの本の次に与えるべきtodoのidを管理します
      */
     private final HashMap<String, Integer> nextTodoId = new HashMap<>();
 
+    private final AccountManager accountManager;
+
+    public TodoManager(AccountManager accountManager) {
+        this.accountManager = accountManager;
+    }
+
 
     /**
      * アカウントと本を指定してそれに所属するtodoをすべて返す
@@ -44,6 +51,12 @@
      */
     public HashMap<Integer, HashMap<Integer, HashMap<Integer, HashMap<Integer, Todo>>>>
         getAllTodos(String accountId, int bookId, String token){
+        if(!todos.containsKey(accountId)){
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND);
+        }
+        if(!todos.get(accountId).containsKey(bookId)){
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND);
+        }
         return todos.get(accountId).get(bookId);
     }
 
@@ -57,6 +70,18 @@
      * @return そのアカウントの本に所属するtodoのうち、指定した年月のtodoを返します
      */
     public HashMap<Integer, HashMap<Integer, Todo>> getTodosByMonth(String accountId, int bookId, int year, int month, String token){
+        if(!todos.containsKey(accountId)){
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND);
+        }
+        if(!todos.get(accountId).containsKey(bookId)){
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND);
+        }
+        if(!todos.get(accountId).get(bookId).containsKey(year)){
+            return new HashMap<Integer, HashMap<Integer, Todo>>();
+        }
+        if(!todos.get(accountId).get(bookId).get(year).containsKey(month)){
+            return new HashMap<Integer, HashMap<Integer, Todo>>();
+        }
         return todos.get(accountId).get(bookId).get(year).get(month);
     }
 
@@ -86,6 +111,21 @@
      * @return そのアカウントの本に所属するtodoのうち、指定した年月日のtodoを返します
      */
     public HashMap<Integer, Todo> getTodosByDay(String accountId, int bookId, int year, int month, int day, String token){
+        if(!todos.containsKey(accountId)){
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND);
+        }
+        if(!todos.get(accountId).containsKey(bookId)){
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND);
+        }
+        if(!todos.get(accountId).get(bookId).containsKey(year)){
+            return new HashMap<Integer, Todo>();
+        }
+        if(!todos.get(accountId).get(bookId).get(year).containsKey(month)){
+            return new HashMap<Integer, Todo>();
+        }
+        if(!todos.get(accountId).get(bookId).get(year).get(month).containsKey(day)){
+            return new HashMap<Integer, Todo>();
+        }
         return todos.get(accountId).get(bookId).get(year).get(month).get(day);
     }
 
@@ -118,6 +158,24 @@
      * @return idを指定してtodoを返す
      */
     public Todo getTodoById(String accountId, int bookId, int year, int month, int day, int todoId, String token){
+        if(!todos.containsKey(accountId)){
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND);
+        }
+        if(!todos.get(accountId).containsKey(bookId)){
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND);
+        }
+        if(!todos.get(accountId).get(bookId).containsKey(year)){
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND);
+        }
+        if(!todos.get(accountId).get(bookId).get(year).containsKey(month)){
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND);
+        }
+        if(!todos.get(accountId).get(bookId).get(year).get(month).containsKey(day)){
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND);
+        }
+        if(!todos.get(accountId).get(bookId).get(year).get(month).get(day).containsKey(todoId)){
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND);
+        }
         return todos.get(accountId).get(bookId).get(year).get(month).get(day).get(todoId);
     }
 
@@ -150,6 +208,7 @@
      * @return 新しいtodoのid
      */
     public int createTodo(String accountId, int bookId, int year, int month, int day, String title, String token){
+
         if(!todos.containsKey(accountId)){
             todos.put(accountId, new HashMap<>());
         }
@@ -202,6 +261,24 @@
      * @param todoId 削除したいtodoのid
      */
     public void deleteTodoById(String accountId, int bookId, int year, int month, int day, int todoId, String token){
+        if(!todos.containsKey(accountId)){
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND);
+        }
+        if(!todos.get(accountId).containsKey(bookId)){
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND);
+        }
+        if(!todos.get(accountId).get(bookId).containsKey(year)){
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND);
+        }
+        if(!todos.get(accountId).get(bookId).get(year).containsKey(month)){
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND);
+        }
+        if(!todos.get(accountId).get(bookId).get(year).get(month).containsKey(day)){
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND);
+        }
+        if(!todos.get(accountId).get(bookId).get(year).get(month).get(day).containsKey(todoId)){
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND);
+        }
         todos.get(accountId).get(bookId).get(year).get(month).get(day).remove(todoId);
     }
 
@@ -230,6 +307,24 @@
      * @param check 変更後の達成状態
      */
     public void setCheck(String accountId, int bookId, int year, int month, int day, int todoId, boolean check, String token){
+        if(!todos.containsKey(accountId)){
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND);
+        }
+        if(!todos.get(accountId).containsKey(bookId)){
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND);
+        }
+        if(!todos.get(accountId).get(bookId).containsKey(year)){
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND);
+        }
+        if(!todos.get(accountId).get(bookId).get(year).containsKey(month)){
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND);
+        }
+        if(!todos.get(accountId).get(bookId).get(year).get(month).containsKey(day)){
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND);
+        }
+        if(!todos.get(accountId).get(bookId).get(year).get(month).get(day).containsKey(todoId)){
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND);
+        }
         todos.get(accountId).get(bookId).get(year).get(month).get(day).get(todoId).setCheck(check);
     }