diff --git a/src/endpoints/notification.tsp b/src/endpoints/notification.tsp
new file mode 100644
index 0000000..87a0762
--- /dev/null
+++ b/src/endpoints/notification.tsp
@@ -0,0 +1,43 @@
+import "@typespec/http";
+import "@typespec/rest";
+import "../models/errors.tsp";
+import "../models/notification.tsp";
+
+using TypeSpec.Http;
+using TypeSpec.Rest;
+
+@service
+namespace SeichiPortalApiSchema;
+
+@tag("Notifications")
+@route("/notifications")
+namespace Notifications {
+  @get
+  @summary("通知一覧を返す")
+  op notifications(): {
+    @statusCode statusCode: 200;
+    @body body: Notification[];
+  } | {
+    @statusCode statusCode: 401 | 403 | 500;
+    @body body: Error;
+  };
+
+  @post
+  @summary("すべて既読にする")
+  op readAll(): {
+    @statusCode statusCode: 204;
+  } | {
+    @statusCode statusCode: 401 | 403 | 500;
+    @body body: Error;
+  };
+
+  @post
+  @summary("通知を既読にする")
+  @route("/{id}")
+  op read(@path id: NotificationId): {
+    @statusCode statusCode: 204;
+  } | {
+    @statusCode statusCode: 401 | 403 | 404 | 500;
+    @body body: Error;
+  };
+}
diff --git a/src/main.tsp b/src/main.tsp
index 84533fb..f7e398b 100644
--- a/src/main.tsp
+++ b/src/main.tsp
@@ -1,6 +1,7 @@
 import "./endpoints/forms.tsp";
 import "./endpoints/users.tsp";
 import "./endpoints/session.tsp";
+import "./endpoints/notification.tsp";
 import "@typespec/openapi";
 
 using TypeSpec.Http;
diff --git a/src/models/notification.tsp b/src/models/notification.tsp
new file mode 100644
index 0000000..7ad86b4
--- /dev/null
+++ b/src/models/notification.tsp
@@ -0,0 +1,20 @@
+enum NotificationSource {
+  FormMessage,
+}
+
+model NotificationSourceInfo {
+  source: NotificationSource;
+  url: string;
+}
+
+@format("uuid")
+scalar NotificationId extends string;
+
+model Notification {
+  @visibility("read")
+  id: NotificationId;
+
+  source: NotificationSourceInfo;
+  title: string;
+  is_read: boolean;
+}