diff --git a/backend/app/Http/Controllers/Api/AdminController.php b/backend/app/Http/Controllers/Api/AdminController.php
index 773ba93e..feb962ba 100644
--- a/backend/app/Http/Controllers/Api/AdminController.php
+++ b/backend/app/Http/Controllers/Api/AdminController.php
@@ -3,63 +3,18 @@
 namespace App\Http\Controllers\Api;
 
 use App\Http\Controllers\Controller, Session;
-use Illuminate\Support\Facades\Validator;
-use Illuminate\Support\Facades\Hash;
-use Illuminate\Support\Facades\Auth;
+use App\Http\Controllers\Api\CommonController as Common;
 use Illuminate\Http\Request;
 
-use App\Models\Admin;
-use App\Models\LoginLimits;
+class AdminController extends Common {
+    private $common;
 
-class AdminController extends Controller {
-    protected $guard = 'admins';
+    public function __construct () {
+        $this->common = new Common('admin');
+    }
 
     public function login (Request $r) {
-        // if (null === $r->server('HTTP_USER_AGENT')) {
-        //     return ['status_code' => 400, 'error_message' => ['不正なuser_agent。']];
-        // }
-
-        // if (null !== ($ll = LoginLimits::where('user_agent', $r->server('HTTP_USER_AGENT'))->first())) {
-        //     if ((time() >= strtotime($ll->updated_at) + 600) === false) {
-        //         LoginLimits::where('user_agent', $r->server('HTTP_USER_AGENT'))->delete();
-        //     }
-        //     if ($ll->fail_number >= 10) {
-        //         return ['status_code' => 400, 'error_message' => ['10回連続で失敗しましたので、10分、ログインロックになりました。']];
-        //     }
-        // }
-
-        $validate = Validator::make($r->all(), [
-            'email' => 'required|max:255|email',
-            'password' => 'required|min:8|max:72',
-        ]);
-
-        if ($validate->fails()) {
-            // バリデーションエラー
-            return ['status_code' => 422, 'error_messages' => $validate->errors()];
-        }
-
-        // 存在しない場合
-        if (null === ($admin = Admin::select('id', 'email', 'password')->where('email', $r->email)->first())) {
-            return ['status_code' => 400, 'error_message' => ['このアカウントが存在しません。']];
-        }
-
-        // パスワードが異なる場合
-        if (!Hash::check($r->password, $admin->password)) {
-            // if ($ll = LoginLimits::where('user_agent', $r->server('HTTP_USER_AGENT'))->first()) {
-            //     LoginLimits::where('user_agent', $r->server('HTTP_USER_AGENT'))->update(['fail_number' => $ll->fail_number+1]);
-            // }
-            // else {
-            //     LoginLimits::create(['user_agent' => $r->server('HTTP_USER_AGENT'), 'fail_number' => 1]);
-            // }
-            return ['status_code' => 400, 'error_message' => ['ログインに失敗しました。10回連続で失敗すると、一定期間ログインできなくなります。']];
-        }
-
-        // セッションを想像する
-        if (Auth::guard('admins')->attempt($r->all())) {
-            Session::put('admin_email', $admin->email);
-            Session::save();
-        }
-        return ['status_code' => 200];
+        return $this->common->login($r);
     }
 
     public function checkLogin () {
diff --git a/backend/app/Http/Controllers/Api/CommonController.php b/backend/app/Http/Controllers/Api/CommonController.php
new file mode 100644
index 00000000..e1bade31
--- /dev/null
+++ b/backend/app/Http/Controllers/Api/CommonController.php
@@ -0,0 +1,88 @@
+<?php
+
+namespace App\Http\Controllers\Api;
+
+use App\Http\Controllers\Controller, Session;
+use Illuminate\Support\Facades\Validator;
+use Illuminate\Support\Facades\Hash;
+use Illuminate\Support\Facades\Auth;
+use Illuminate\Http\Request;
+use Illuminate\Support\Facades\Log;
+
+use App\Models\Admin;
+use App\Models\Father;
+use App\Models\Child;
+// use App\Models\LoginLimits;
+
+class CommonController extends Controller {
+    private $guard;
+    private $guards;
+    private $model;
+
+    public function __construct ($guard) {
+        $this->guard = $guard;
+        $this->guards = $guard.'s';
+
+        $select = ['id', 'email', 'password'];
+
+        if ($this->guard == 'admin') {
+            $this->model = Admin::select($select);
+        }
+        else if ($this->guard == 'father') {
+            $this->model = Father::select($select);
+        }
+        else if ($this->guard == 'child') {
+            $this->guards = $guard.'ren';
+            $this->model = Child::select($select);
+        }
+    }
+
+    public function login (Request $r) {
+        // if (null === $r->server('HTTP_USER_AGENT')) {
+        //     return ['status_code' => 400, 'error_message' => ['不正なuser_agent。']];
+        // }
+
+        // if (null !== ($ll = LoginLimits::where('user_agent', $r->server('HTTP_USER_AGENT'))->first())) {
+        //     if ((time() >= strtotime($ll->updated_at) + 600) === false) {
+        //         LoginLimits::where('user_agent', $r->server('HTTP_USER_AGENT'))->delete();
+        //     }
+        //     if ($ll->fail_number >= 10) {
+        //         return ['status_code' => 400, 'error_message' => ['10回連続で失敗しましたので、10分、ログインロックになりました。']];
+        //     }
+        // }
+
+        $validate = Validator::make($r->all(), [
+            'email' => 'required|max:255|email',
+            'password' => 'required|min:8|max:72',
+        ]);
+
+        if ($validate->fails()) {
+            // バリデーションエラー
+            return ['status_code' => 422, 'error_messages' => $validate->errors()];
+        }
+
+        // 存在しない場合
+        if (null === ($get = $this->model->where('email', $r->email)->first())) {
+            return ['status_code' => 400, 'error_message' => ['ログインに失敗しました。10回連続で失敗すると、一定期間ログインできなくなります。']];
+        }
+
+        // パスワードが異なる場合
+        if (!Hash::check($r->password, $get->password)) {
+            // if ($ll = LoginLimits::where('user_agent', $r->server('HTTP_USER_AGENT'))->first()) {
+            //     LoginLimits::where('user_agent', $r->server('HTTP_USER_AGENT'))->update(['fail_number' => $ll->fail_number+1]);
+            // }
+            // else {
+            //     LoginLimits::create(['user_agent' => $r->server('HTTP_USER_AGENT'), 'fail_number' => 1]);
+            // }
+            return ['status_code' => 400, 'error_message' => ['ログインに失敗しました。10回連続で失敗すると、一定期間ログインできなくなります。']];
+        }
+
+        // セッションを想像する
+        if (Auth::guard($this->guards)->attempt($r->all())) {
+            Session::put($this->guard.'_email', $get->email);
+            Session::save();
+        }
+
+        return ['status_code' => 200];
+    }
+}
diff --git a/backend/app/Http/Controllers/Api/FathersController.php b/backend/app/Http/Controllers/Api/FathersController.php
index 2a26f7f4..700502ec 100644
--- a/backend/app/Http/Controllers/Api/FathersController.php
+++ b/backend/app/Http/Controllers/Api/FathersController.php
@@ -2,7 +2,8 @@
 
 namespace App\Http\Controllers\Api;
 
-use App\Http\Controllers\Controller;
+use App\Http\Controllers\Controller, Session;
+use App\Http\Controllers\Api\CommonController as Common;
 use Illuminate\Support\Facades\Validator;
 use Illuminate\Support\Facades\Hash;
 use Illuminate\Http\Request;
@@ -12,37 +13,15 @@ use App\Models\Father;
 use App\Models\FatherRelation;
 use App\Models\EmailActivations;
 
-class FathersController extends Controller {
-    protected $guard = 'fathers';
+class FathersController extends Common {
+    private $common;
+
+    public function __construct () {
+        $this->common = new Common('father');
+    }
 
     public function login (Request $r) {
-        $validate = Validator::make($r->all(), [
-            'email' => 'required|max:255|email',
-            'password' => 'required|min:8|max:72',
-        ]);
-
-        if ($validate->fails()) {
-            // バリデーションエラー
-            return ['status_code' => 422, 'error_messages' => $validate->errors()];
-        }
-
-        // 存在しない場合
-        if (null === ($father = Father::select('id', 'email', 'password')->where('email', $r->email)->first())) {
-            return ['status_code' => 400, 'error_message' => ['このアカウントが存在しません。']];
-        }
-
-        // パスワードが異なる場合
-        if (!Hash::check($r->password, $father->password)) {
-            return ['status_code' => 400, 'error_message' => ['ログインに失敗しました。10回連続で失敗すると、一定期間ログインできなくなります。']];
-        }
-
-        // セッションを想像する
-        if (Auth::guard($this->guard)->attempt($r->all())) {
-            Session::put('father_email', $father->email);
-            Session::save();
-        }
-
-        return ['status_code' => 200];
+        return $this->common->login($r);
     }
 
     public function requestPassword () {}