diff --git a/backend/app/Http/Controllers/Api/FathersController.php b/backend/app/Http/Controllers/Api/FathersController.php
index 18f53137..cdb6a5d2 100644
--- a/backend/app/Http/Controllers/Api/FathersController.php
+++ b/backend/app/Http/Controllers/Api/FathersController.php
@@ -123,6 +123,8 @@ class FathersController extends Controller {
     }
 
     public function registerMain (Request $r) {
+        if ($r->image == 'null') $r->image = null;
+
         // 電話番号の文字数。
         Validator::extend('tel_size', function ($attribute, $value, $params, $validator) {
             return $this->telsize($value);
@@ -161,11 +163,13 @@ class FathersController extends Controller {
 
         $password = Hash::make($r->password);
 
-        $ext = explode('/', mime_content_type($r->image))[1];
-        $lastid = Father::select('id')->orderBy('id', 'desc')->first();
-        $filename = $this->uuidv4() . '.'.$ext;
-        $image = base64_decode(substr($r->image, strpos($r->image, ',') + 1));
-        Storage::disk('public')->put($filename, $image);
+        if (!is_null($r->image)) {
+            $ext = explode('/', mime_content_type($r->image))[1];
+            $lastid = Father::select('id')->orderBy('id', 'desc')->first();
+            $filename = $this->uuidv4() . '.'.$ext;
+            $image = base64_decode(substr($r->image, strpos($r->image, ',') + 1));
+            Storage::disk('public')->put($filename, $image);
+        }
 
         try {
             // DBの値の準備。
@@ -175,7 +179,7 @@ class FathersController extends Controller {
                 'email' => $get->email,
                 'password' => $password,
                 'company' => $r->company,
-                'image' => '/storage/'.$filename,
+                'image' => !is_null($r->image) ? '/storage/'.$filename : '/assets/default/avatar.jpg',
                 'profile' => $r->profile,
                 'tel' => $r->tel,
             ];
diff --git a/backend/app/Http/Controllers/Api/MeetingImagesController.php b/backend/app/Http/Controllers/Api/MeetingImagesController.php
index cc052dd6..35dc4357 100644
--- a/backend/app/Http/Controllers/Api/MeetingImagesController.php
+++ b/backend/app/Http/Controllers/Api/MeetingImagesController.php
@@ -12,7 +12,7 @@ use App\Models\MeetingImage;
 
 class MeetingImagesController extends Controller {
     public function register (Request $r) {
-        if (!isset($r->meeting_id) || !isset($r->image)) {
+        if (!isset($r->meeting_id) || !isset($r->image) || empty(json_decode($r->image))) {
             return ['status_code' => 400];
         }
 
@@ -22,12 +22,12 @@ class MeetingImagesController extends Controller {
 
         // ファイルサイズは10MiB以内
         Validator::extend('image_size', function ($attribute, $value, $params, $validator) {
-            return $this->imagesize($value);
+            return $this->imagesizemulti($value);
         });
 
         // ミームタイプ
         Validator::extend('image_meme', function ($attribute, $value, $params, $validator) {
-            return $this->imagememe($value);
+            return $this->imagemememulti($value);
         });
 
         // バリデーションエラー
@@ -37,19 +37,20 @@ class MeetingImagesController extends Controller {
             return ['status_code' => 422, 'error_messages' => $validate->errors()];
         }
 
-        $ext = explode('/', mime_content_type($r->image))[1];
-        $filename = $this->uuidv4() . '.'.$ext;
-
         try {
-            $image = base64_decode(substr($r->image, strpos($r->image, ',') + 1));
-            Storage::disk('public')->put($filename, $image);
+            foreach (json_decode($r->image) as $img) {
+                $ext = explode('/', mime_content_type($img))[1];
+                $filename = $this->uuidv4() . '.'.$ext;
+                $image = base64_decode(substr($img, strpos($img, ',') + 1));
+                Storage::disk('public')->put($filename, $image);
 
-            $insert = [
-                'meeting_id' => (int)$r->meeting_id,
-                'image' => '/storage/'.$filename,
-            ];
+                $insert = [
+                    'meeting_id' => (int)$r->meeting_id,
+                    'image' => '/storage/'.$filename,
+                ];
 
-            MeetingImage::create($insert);
+                MeetingImage::create($insert);
+            }
         } catch (\Throwable $e) {
             // 失敗
             Log::critical($e->getMessage());
@@ -67,17 +68,19 @@ class MeetingImagesController extends Controller {
     }
 
     public function delete ($meeting_id, Request $r) {
-        if (!isset($meeting_id) || !isset($r->image_id)) {
-            return ['status_code' => 400];
-        }
-
-        if (null === ($get = MeetingImage::select('image')->where('id', (int)$r->image_id)->first())) {
+        if (!isset($meeting_id) || !isset($r->image_id) || empty(json_decode($r->image_id))) {
             return ['status_code' => 400];
         }
 
         try {
-            MeetingImage::where('id', (int)$r->image_id)->delete();
-            Storage::disk('public')->delete($get->image);
+            foreach (json_decode($r->image_id) as $img) {
+                if (null === ($get = MeetingImage::select('image')->where('id', (int)$img)->first())) {
+                    return ['status_code' => 400];
+                }
+
+                MeetingImage::where('id', (int)$img)->delete();
+                Storage::disk('public')->delete($get->image);
+            }
         } catch (\Throwable $e) {
             // 失敗
             Log::critical($e->getMessage());
diff --git a/backend/app/Http/Controllers/Controller.php b/backend/app/Http/Controllers/Controller.php
index cfc024f8..9e2f97d4 100644
--- a/backend/app/Http/Controllers/Controller.php
+++ b/backend/app/Http/Controllers/Controller.php
@@ -50,6 +50,7 @@ class Controller extends BaseController
     }
 
     public function imagesizecannull ($value) {
+        if ($value == 'null') $value = null;
         if (is_null($value)) return true;
         return $this->imagesize($value);
     }
@@ -68,6 +69,7 @@ class Controller extends BaseController
     }
 
     public function imagememecannull ($value) {
+        if ($value == 'null') $value = null;
         if (is_null($value)) return true;
         return $this->imagememe($value);
     }
@@ -98,6 +100,25 @@ class Controller extends BaseController
         }
     }
 
+    public function imagemememulti ($value) {
+        try {
+            $ok = true;
+            foreach (json_decode($value) as $v) {
+                if (
+                    mime_content_type($value) != 'image/jpeg' && // jpg
+                    mime_content_type($value) != 'image/png'  && // png
+                    mime_content_type($value) != 'image/gif'     // gif
+                ) {
+                    $ok = false;
+                }
+            }
+            return $ok;
+        } catch (\Throwable $e) {
+            Log::critical($e->getMessage());
+            return false;
+        }
+    }
+
     public function imagesizemulti ($value) {
         try {
             $ok = true;