diff --git a/task_yell/src/app/home/page.tsx b/task_yell/src/app/home/page.tsx
index db2bd19..9b766bd 100644
--- a/task_yell/src/app/home/page.tsx
+++ b/task_yell/src/app/home/page.tsx
@@ -28,7 +28,7 @@ import {
 import { Switch } from "@/components/ui/switch";
 import { Textarea } from "@/components/ui/textarea";
 import { signOut } from "@/firebase/auth";
-import { auth } from "@/firebase/client-app";
+import { auth, db } from "@/firebase/client-app";
 import { createEvent, readEvents } from "@/lib/events";
 import { Category, Priority } from "@/lib/types";
 import {
@@ -57,6 +57,12 @@ import {
   subMonths,
 } from "date-fns";
 import { ja } from "date-fns/locale";
+import {
+  doc,
+  getDoc,
+  setDoc,
+  updateDoc,
+} from "firebase/firestore";
 import { AnimatePresence, motion, useDragControls } from "framer-motion";
 import {
   ChevronLeft,
@@ -756,10 +762,31 @@ export default function Home() {
                     {item.label}
                   </Button>
                   {item.label === "通知" && isNotificationsOpen && (
-                    <div className="ml-7 mt-2 space-y-4">
+                    <form
+                      className="ml-7 mt-2 space-y-4"
+                      action={async (data) => {
+                        if (auth.currentUser) {
+                          const docRef = doc(db, "users", auth.currentUser.uid);
+                          const snapshot = await getDoc(docRef);
+                          if (snapshot.exists()) {
+                            await updateDoc(docRef, {
+                              phoneNumber: data.get("phoneNumber"),
+                            });
+                          } else {
+                            setDoc(docRef, {
+                              phoneNumber: data.get("phoneNumber"),
+                            });
+                          }
+                        }
+                      }}
+                    >
                       <div className="space-y-2">
                         <Label htmlFor="phone">電話番号</Label>
-                        <Input id="phone" placeholder="電話番号を入力" />
+                        <Input
+                          id="phone"
+                          name="phoneNumber"
+                          placeholder="+8190XXXXYYYY"
+                        />
                       </div>
                       <div className="flex items-center space-x-2">
                         <Switch
@@ -769,7 +796,8 @@ export default function Home() {
                         />
                         <Label htmlFor="notifications">通知を有効にする</Label>
                       </div>
-                    </div>
+                      <Button type="submit">保存</Button>
+                    </form>
                   )}
                 </li>
               ))}