diff --git a/app/Email/Guests/PasswordSettingStart.php b/app/Email/Guests/PasswordSettingStart.php
new file mode 100644
index 0000000..086df31
--- /dev/null
+++ b/app/Email/Guests/PasswordSettingStart.php
@@ -0,0 +1,35 @@
+<?php
+
+namespace App\Email\Guests;
+
+use App\Models\PasswordSettingToken;
+
+class PasswordSettingStart extends Guest
+{
+
+    public function __construct(private PasswordSettingToken $token)
+    {
+    }
+
+    public function getTemplateName(): string
+    {
+        return 'emails.guests.password_setting_start';
+    }
+
+    public function getSubject(): string
+    {
+        return "ログインパスワード変更手続きのお知らせ";
+    }
+
+    public function getGuestParams(): array
+    {
+        return [
+            'url' => $this->getVerifyUrl(),
+        ];
+    }
+
+    private function getVerifyUrl(): string
+    {
+        return $this->getAppUrl(['setting', 'password', 'verify', $this->token->token]);
+    }
+}
diff --git a/app/Http/Controllers/Web/Auth/LoginController.php b/app/Http/Controllers/Web/Auth/LoginController.php
index 938e072..aec001b 100644
--- a/app/Http/Controllers/Web/Auth/LoginController.php
+++ b/app/Http/Controllers/Web/Auth/LoginController.php
@@ -43,9 +43,6 @@ class LoginController extends WebController
             return $this->failedResponse();
         }
 
-        /**
-         * @var Customer
-         */
         $customer = $customer->first();
 
         $kintoneId = $customer->getRecordId();
@@ -66,7 +63,6 @@ class LoginController extends WebController
                 $user->save();
             }
 
-
             if (Auth::attempt([
                 'email' => $param->email,
                 'password' => $param->password,
@@ -76,22 +72,7 @@ class LoginController extends WebController
                 return $this->failedResponse();
             }
         } else {
-            // 初回ログインのケース
-            $password = "testtest";
-            $user = new User();
-            $user->email = $param->email;
-            $user->kintone_id = $customer->getRecordId();
-            $user->password = $password;
-            $user->kintone_customer_code = $customer->getNumber(Customer::FIELD_CUSTOMER_CODE);
-            $user->save();
-            if (Auth::attempt([
-                'email' => $param->email,
-                'password' => $password,
-            ])) {
-                return $this->successResponse($customer->toArray());
-            } else {
-                return $this->failedResponse();
-            }
+            return $this->failedResponse();
         }
     }
 }
diff --git a/app/Http/Controllers/Web/Auth/PasswordSettingStartController.php b/app/Http/Controllers/Web/Auth/PasswordSettingStartController.php
new file mode 100644
index 0000000..d0cb290
--- /dev/null
+++ b/app/Http/Controllers/Web/Auth/PasswordSettingStartController.php
@@ -0,0 +1,77 @@
+<?php
+
+namespace App\Http\Controllers\Web\Auth;
+
+use App\Http\Controllers\Web\WebController;
+use App\Kintone\Models\Customer;
+use App\Logic\PasswordSettingManager;
+use App\Models\User;
+use Illuminate\Http\JsonResponse;
+use Illuminate\Http\Request;
+
+class PasswordSettingStartController extends WebController
+{
+
+    public function name(): string
+    {
+        return "パスワード設定開始";
+    }
+
+    public function description(): string
+    {
+        return "パスワード設定手続きを開始する";
+    }
+
+
+    public function __construct(protected PasswordSettingStartParam $param, private PasswordSettingManager $manager)
+    {
+        parent::__construct();
+    }
+
+    protected function run(Request $request): JsonResponse
+    {
+        $param = $this->param;
+
+        $access = Customer::getAccess();
+        $query = Customer::getQuery()->where(Customer::FIELD_EMAIL, $param->email);
+
+        $customer = $access->some($query);
+
+        if ($customer->count() !== 1) {
+
+            // 無効なユーザだが、セキュリティ対策として成功と見せかける
+            return $this->successResponse();
+        }
+
+        $customer = $customer->first();
+
+        $kintoneId = $customer->getRecordId();
+
+        $user = User::whereKintoneId($kintoneId)
+            ->first();
+
+        if ($user instanceof User) {
+            //データ同期
+            if ($user->email !== $param->email) {
+                $user->email = $param->email;
+                $user->save();
+            }
+            if ($user->kintone_customer_code !== $customer->getNumber(Customer::FIELD_CUSTOMER_CODE)) {
+                $user->kintone_customer_code = $customer->getNumber(Customer::FIELD_CUSTOMER_CODE);
+                $user->save();
+            }
+        } else {
+            // 新規の場合はユーザーを追加する
+            $user = new User();
+            $user->email = $param->email;
+            $user->kintone_id = $customer->getRecordId();
+            $user->kintone_customer_code = $customer->getNumber(Customer::FIELD_CUSTOMER_CODE);
+            $user->save();
+        }
+
+        // トークン生成
+        $this->manager->generate($user);
+
+        return $this->successResponse();
+    }
+}
diff --git a/app/Http/Controllers/Web/Auth/PasswordSettingStartParam.php b/app/Http/Controllers/Web/Auth/PasswordSettingStartParam.php
new file mode 100644
index 0000000..ec80827
--- /dev/null
+++ b/app/Http/Controllers/Web/Auth/PasswordSettingStartParam.php
@@ -0,0 +1,19 @@
+<?php
+
+namespace App\Http\Controllers\Web\Auth;
+
+use App\Http\Controllers\Web\BaseParam;
+use App\Http\Controllers\Web\Rule;
+
+/**
+ * @property string $email
+ */
+class PasswordSettingStartParam extends BaseParam
+{
+    public function rules(): array
+    {
+        return [
+            'email' => $this->str([...Rule::email()]),
+        ];
+    }
+}
diff --git a/app/Http/Controllers/Web/Auth/PasswordSettingVerifyController.php b/app/Http/Controllers/Web/Auth/PasswordSettingVerifyController.php
new file mode 100644
index 0000000..d526a14
--- /dev/null
+++ b/app/Http/Controllers/Web/Auth/PasswordSettingVerifyController.php
@@ -0,0 +1,45 @@
+<?php
+
+namespace App\Http\Controllers\Web\Auth;
+
+use App\Http\Controllers\Web\WebController;
+use App\Kintone\Models\Customer;
+use App\Logic\PasswordSettingManager;
+use App\Models\User;
+use Illuminate\Http\JsonResponse;
+use Illuminate\Http\Request;
+
+class PasswordSettingVerifyController extends WebController
+{
+
+    public function name(): string
+    {
+        return "パスワード設定認証";
+    }
+
+    public function description(): string
+    {
+        return "パスワード設定手続きを認証する";
+    }
+
+
+    public function __construct(protected PasswordSettingVerifyParam $param, private PasswordSettingManager $manager)
+    {
+        parent::__construct();
+    }
+
+    protected function run(Request $request): JsonResponse
+    {
+        $param = $this->param;
+
+        $user = $this->manager->verify($param->token);
+        if ($user === null) {
+            return $this->failedResponse();
+        }
+
+        $user->password = $param->password;
+        $user->save();
+
+        return $this->successResponse();
+    }
+}
diff --git a/app/Http/Controllers/Web/Auth/PasswordSettingVerifyParam.php b/app/Http/Controllers/Web/Auth/PasswordSettingVerifyParam.php
new file mode 100644
index 0000000..087f952
--- /dev/null
+++ b/app/Http/Controllers/Web/Auth/PasswordSettingVerifyParam.php
@@ -0,0 +1,21 @@
+<?php
+
+namespace App\Http\Controllers\Web\Auth;
+
+use App\Http\Controllers\Web\BaseParam;
+use App\Rules\LoginPassword;
+
+/**
+ * @property string $token
+ * @property string $password
+ */
+class PasswordSettingVerifyParam extends BaseParam
+{
+    public function rules(): array
+    {
+        return [
+            'token' => $this->str(),
+            'password' => $this->str([new LoginPassword()]),
+        ];
+    }
+}
diff --git a/app/Listeners/Model/UpdatingListener.php b/app/Listeners/Model/UpdatingListener.php
index da8ee48..fca496e 100644
--- a/app/Listeners/Model/UpdatingListener.php
+++ b/app/Listeners/Model/UpdatingListener.php
@@ -25,7 +25,9 @@ class UpdatingListener extends ModelListener
         // ログインパスワードのハッシュ化
         if ($event->model instanceof User) {
             if ($event->model->isDirty(User::COL_NAME_PASSWORD)) {
-                $event->model->password = Hash::make($event->model->password);
+                if ($event->model->password !== null) {
+                    $event->model->password = Hash::make($event->model->password);
+                }
             }
         }
 
diff --git a/app/Logic/PasswordSettingManager.php b/app/Logic/PasswordSettingManager.php
new file mode 100644
index 0000000..1520b8b
--- /dev/null
+++ b/app/Logic/PasswordSettingManager.php
@@ -0,0 +1,50 @@
+<?php
+
+namespace App\Logic;
+
+use App\Email\Guests\PasswordSettingStart;
+use App\Models\PasswordSettingToken;
+use App\Models\User;
+use App\Util\DateUtil;
+use Illuminate\Support\Str;
+
+class PasswordSettingManager
+{
+
+    public function __construct()
+    {
+    }
+
+    public function generate(User $user)
+    {
+        // トークン生成
+        $model = new PasswordSettingToken();
+        $model->user_id = $user->id;
+        $model->token = Str::uuid();
+        $model->expires_at = DateUtil::now()->addHours(24);
+        $model->save();
+
+        // メール送信
+        $email = (new PasswordSettingStart($model))
+            ->setEmail($user->email);
+        $emailManager = new EmailManager($email);
+        $emailManager->confirm();
+    }
+
+    public function verify(string $token): User|null
+    {
+        $model = PasswordSettingToken::whereToken($token)
+            ->expiresIn()
+            ->first();
+
+        if ($model === null) {
+            return null;
+        }
+
+        $user = User::whereId($model->user_id)->firstOrFail();
+
+        $model->delete();
+
+        return $user;
+    }
+}
diff --git a/app/Models/PasswordSettingToken.php b/app/Models/PasswordSettingToken.php
new file mode 100644
index 0000000..19bb402
--- /dev/null
+++ b/app/Models/PasswordSettingToken.php
@@ -0,0 +1,35 @@
+<?php
+
+namespace App\Models;
+
+use App\Models\Feature\UserId;
+use App\Util\DateUtil;
+use Illuminate\Database\Eloquent\Builder;
+
+class PasswordSettingToken extends AppModel
+{
+    use UserId;
+
+    const COL_NAME_USER_ID = ColumnName::USER_ID;
+    const COL_NAME_TOKEN = 'token';
+    const COL_NAME_EXPIRES_AT = 'expires_at';
+
+    protected $casts = [
+        self::COL_NAME_EXPIRES_AT => 'datetime',
+    ];
+
+    public function getHistory(): ?HistoryModel
+    {
+        return null;
+    }
+
+    public function getModelName(): string
+    {
+        return "ログインパスワード設定トークン";
+    }
+
+    public function scopeExpiresIn(Builder $query)
+    {
+        return $query->where(self::COL_NAME_EXPIRES_AT, '>', DateUtil::now());
+    }
+}
diff --git a/database/migrations/2014_10_12_000000_create_users_table.php b/database/migrations/2014_10_12_000000_create_users_table.php
index cfc308d..ebbf6b8 100644
--- a/database/migrations/2014_10_12_000000_create_users_table.php
+++ b/database/migrations/2014_10_12_000000_create_users_table.php
@@ -16,9 +16,9 @@ return new class extends Migration
             $helper = new MigrationHelper($table);
             $helper->baseColumn();
             $table->string('email')->unique()->comment('Email');
-            $table->string('password')->comment('ログインパスワード');
-            $table->string('kintone_id')->comment('KintoneID');
-            $table->string('kintone_customer_code')->comment('顧客コード');
+            $table->string('password')->nullable()->comment('ログインパスワード');
+            $table->string('kintone_id')->nullable()->comment('KintoneID');
+            $table->string('kintone_customer_code')->nullable()->comment('顧客コード');
 
             $helper->index(1, ['email']);
             $helper->index(2, ['kintone_id']);
@@ -29,9 +29,9 @@ return new class extends Migration
             $helper->baseColumn();
 
             $table->string('email')->comment('Email');
-            $table->string('password')->comment('ログインパスワード');
-            $table->string('kintone_id')->comment('KintoneID');
-            $table->string('kintone_customer_code')->comment('顧客コード');
+            $table->string('password')->nullable()->comment('ログインパスワード');
+            $table->string('kintone_id')->nullable()->comment('KintoneID');
+            $table->string('kintone_customer_code')->nullable()->comment('顧客コード');
 
             $helper->index(1, ['email']);
             $helper->index(2, ['kintone_id']);
diff --git a/database/migrations/2023_09_22_154100_create_password_setting_tokens_table.php b/database/migrations/2023_09_22_154100_create_password_setting_tokens_table.php
new file mode 100644
index 0000000..ff2b196
--- /dev/null
+++ b/database/migrations/2023_09_22_154100_create_password_setting_tokens_table.php
@@ -0,0 +1,37 @@
+<?php
+
+use App\Models\ColumnName;
+use App\Util\MigrationHelper;
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::create('password_setting_tokens', function (Blueprint $table) {
+            $helper = new MigrationHelper($table);
+            $helper->baseColumn();
+
+            $table->uuid(ColumnName::USER_ID)->unique()->comment('ユーザーID');
+            $table->uuid('token')->unique()->comment('トークン');
+            $table->string('expires_at')->comment('有効期限');
+
+            $helper->index(1, [ColumnName::USER_ID]);
+            $helper->index(3, ['token']);
+            $helper->index(4, ['expires_at']);
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::dropIfExists('email_change_tokens');
+    }
+};
diff --git a/resources/views/emails/guests/password_setting_start.blade.php b/resources/views/emails/guests/password_setting_start.blade.php
new file mode 100644
index 0000000..54ef19d
--- /dev/null
+++ b/resources/views/emails/guests/password_setting_start.blade.php
@@ -0,0 +1,6 @@
+@extends('emails.layouts.guest')
+
+@section('contents')
+こちらのURLにアクセスし、ログインパスワードの変更手続きを進めてください。
+{{ $url }}
+@endsection
\ No newline at end of file
diff --git a/routes/api.php b/routes/api.php
index 8fdb9df..57e579f 100644
--- a/routes/api.php
+++ b/routes/api.php
@@ -34,3 +34,6 @@ RouteHelper::post('/ask', App\Http\Controllers\Web\FAQ\AskController::class);
 
 RouteHelper::post('/email/change/start', App\Http\Controllers\Web\Customer\ChangeEmailStartController::class);
 RouteHelper::post('/email/change/verify', App\Http\Controllers\Web\Customer\ChangeEmailVerifyController::class);
+
+RouteHelper::post('/password/setting/start', App\Http\Controllers\Web\Auth\PasswordSettingStartController::class);
+RouteHelper::post('/password/setting/verify', App\Http\Controllers\Web\Auth\PasswordSettingVerifyController::class);