diff --git a/src/main/java/org/ntlab/tampoposerver/models/Notification.java b/src/main/java/org/ntlab/tampoposerver/models/Notification.java
index 12994c4..ccefd39 100644
--- a/src/main/java/org/ntlab/tampoposerver/models/Notification.java
+++ b/src/main/java/org/ntlab/tampoposerver/models/Notification.java
@@ -7,6 +7,14 @@
     private String text;
     private String time;
 
+    public Notification(String u, String n, String f, String tx, String tm) {
+        userId = u;
+        notificationId = n;
+        from = f;
+        text = tx;
+        time = tm;
+    }
+
     public String getUserId() {
         return userId;
     }
diff --git a/src/main/java/org/ntlab/tampoposerver/repositories/NotificationRepository.java b/src/main/java/org/ntlab/tampoposerver/repositories/NotificationRepository.java
index bbaadfd..d0d1642 100644
--- a/src/main/java/org/ntlab/tampoposerver/repositories/NotificationRepository.java
+++ b/src/main/java/org/ntlab/tampoposerver/repositories/NotificationRepository.java
@@ -3,17 +3,44 @@
 import org.ntlab.tampoposerver.models.Notification;
 import org.springframework.stereotype.Repository;
 
+import java.util.ArrayList;
 import java.util.HashMap;
+import java.util.List;
+import java.util.stream.Collectors;
 
 @Repository
 public class NotificationRepository {
     private HashMap<String, HashMap<String, Notification>> notificationMap = new HashMap<>();
 
-    public NotificationRepository() {
-        Notification n1 = new Notification();
-        notificationMap.put("uid01", new HashMap<>());
-        notificationMap.get("uid01").put("nid01", n1);
+    //通知の追加
+    public Notification addNotification(String userId, String notificationId, String from, String text, String time) {
+        Notification n = new Notification(userId, notificationId, from, text, time);
 
-        Notification result = notificationMap.get("uid01").get("nid01");
+        if(notificationMap.get(userId) == null) {
+            notificationMap.put(userId, new HashMap<>());
+        }
+        notificationMap.get(userId).put(notificationId, n);
+
+        return n;
+    }
+
+    //通知の取得
+    public Notification getNotification(String userId, String notificationId){
+        if(notificationMap.get(userId) == null) {
+            return null;
+        }
+        return notificationMap.get(userId).get(notificationId);
+    }
+
+    //ユーザーに対応した通知リストの取得(時刻降順)
+    public List<String> getNotificationsForUser(String userId){
+        if(notificationMap.get(userId) == null) {
+            return new ArrayList<>();
+        }
+
+        return notificationMap.get(userId).values().stream()
+                .sorted((a, b) -> b.getTime().compareTo(a.getTime()))
+                .map(Notification::getNotificationId)
+                .collect(Collectors.toList());
     }
 }
diff --git a/src/test/java/org/ntlab/tampoposerver/models/NotificationTest.java b/src/test/java/org/ntlab/tampoposerver/models/NotificationTest.java
new file mode 100644
index 0000000..59c6998
--- /dev/null
+++ b/src/test/java/org/ntlab/tampoposerver/models/NotificationTest.java
@@ -0,0 +1,27 @@
+package org.ntlab.tampoposerver.models;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+
+@SpringBootTest
+public class NotificationTest {
+
+    @Test
+    void contextLoads() {
+        Notification n1 = new Notification("u01","n01","u100","telephone","2025/6/5");
+        Notification n2 = new Notification("u02","n02","u100","telephone","2025/6/5");
+        assertEquals("u01", n1.getUserId());
+        assertEquals("n01", n1.getNotificationId());
+        assertEquals("u100", n1.getFrom());
+        assertEquals("telephone", n1.getText());
+        assertEquals("2025/6/5", n1.getTime());
+        assertEquals("u02", n2.getUserId());
+        assertEquals("n02", n2.getNotificationId());
+        assertEquals("u100", n2.getFrom());
+        assertEquals("telephone", n2.getText());
+        assertEquals("2025/6/5", n2.getTime());
+    }
+}
diff --git a/src/test/java/org/ntlab/tampoposerver/repositories/NotificationRepositoryTest.java b/src/test/java/org/ntlab/tampoposerver/repositories/NotificationRepositoryTest.java
new file mode 100644
index 0000000..698f01f
--- /dev/null
+++ b/src/test/java/org/ntlab/tampoposerver/repositories/NotificationRepositoryTest.java
@@ -0,0 +1,33 @@
+package org.ntlab.tampoposerver.repositories;
+
+import org.junit.jupiter.api.Test;
+import org.ntlab.tampoposerver.models.Notification;
+import org.springframework.boot.test.context.SpringBootTest;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNull;
+
+@SpringBootTest
+public class NotificationRepositoryTest {
+
+    @Test
+    void contextLoads() {
+        NotificationRepository notificationRepository = new NotificationRepository();
+
+        Notification n1_1 = notificationRepository.addNotification("u01","n01","u00","telephone1","2025-06-10 10:00:11");
+        Notification n1_2 = notificationRepository.addNotification("u01","n02","u02","telephone2","2025-06-07 10:31:11");
+        Notification n1_3 = notificationRepository.addNotification("u01","n03","u02","telephone2","2025-06-07 12:09:22");
+        Notification n2 = notificationRepository.addNotification("u02","n01","u00","telephone3","2025-06-07 09:22:12");
+
+        Notification n = notificationRepository.getNotification("u01","n02");
+        assertEquals(n1_2.getText(),n.getText());
+
+        n = notificationRepository.getNotification("u01","n04");
+        assertNull(n);
+
+        n = notificationRepository.getNotification("u03","n03");
+        assertNull(n);
+
+        System.out.println(notificationRepository.getNotificationsForUser("u01"));
+    }
+}