diff --git a/app/config/eccube/packages/eccube.yaml b/app/config/eccube/packages/eccube.yaml
index 907d1c51d27..7986d3da160 100644
--- a/app/config/eccube/packages/eccube.yaml
+++ b/app/config/eccube/packages/eccube.yaml
@@ -124,3 +124,6 @@ parameters:
     eccube_result_cache_lifetime: 3600 # doctrineのresult cacheのlifetime.
     eccube_result_cache_lifetime_short: 10  # doctrineのresult cacheのlifetime. 商品一覧画面など長期間キャッシュできない箇所で使用する.
     eccube_content_maintenance_file_path: '%env(ECCUBE_MAINTENANCE_FILE_PATH)%'
+    eccube_product_image_resize: false
+    eccube_product_image_jpg_quality: 75
+    eccube_product_image_png_quality: 6
diff --git a/src/Eccube/Controller/Admin/Product/ProductController.php b/src/Eccube/Controller/Admin/Product/ProductController.php
index 90fa68b9694..0dced13bb8a 100644
--- a/src/Eccube/Controller/Admin/Product/ProductController.php
+++ b/src/Eccube/Controller/Admin/Product/ProductController.php
@@ -173,7 +173,7 @@ public function index(Request $request, $page_no = null, Paginator $paginator)
          * - デフォルト値
          * また, セッションに保存する際は mtb_page_maxと照合し, 一致した場合のみ保存する.
          **/
-        $page_count = $this->session->get('eccube.admin.order.search.page_count',
+        $page_count = $this->session->get('eccube.admin.product.search.page_count',
             $this->eccubeConfig->get('eccube_default_page_count'));
 
         $page_count_param = (int) $request->get('page_count');
@@ -183,7 +183,7 @@ public function index(Request $request, $page_no = null, Paginator $paginator)
             foreach ($pageMaxis as $pageMax) {
                 if ($page_count_param == $pageMax->getName()) {
                     $page_count = $pageMax->getName();
-                    $this->session->set('eccube.admin.order.search.page_count', $page_count);
+                    $this->session->set('eccube.admin.product.search.page_count', $page_count);
                     break;
                 }
             }
@@ -330,9 +330,64 @@ public function addImage(Request $request)
                         throw new UnsupportedMediaTypeHttpException();
                     }
 
-                    $filename = date('mdHis').uniqid('_').'.'.$extension;
-                    $image->move($this->eccubeConfig['eccube_temp_image_dir'], $filename);
-                    $files[] = $filename;
+                    // リサイズ処理の可否（'eccube_product_image_resize'）
+                    if ($this->eccubeConfig->get('eccube_product_image_resize')) {
+
+                        // 加工前の画像の情報を取得
+                        list($origin_w, $origin_h, $type) = getimagesize($image);
+
+                        // 加工前のファイルをフォーマット別に読み出す
+                        switch ($type) {
+                            case IMAGETYPE_JPEG:
+                                $origin_image = imagecreatefromjpeg($image);
+                                break;
+
+                            case IMAGETYPE_PNG:
+                                $origin_image = imagecreatefrompng($image);
+                                break;
+
+                            case IMAGETYPE_GIF:
+                                $origin_image = imagecreatefromgif($image);
+                                break;
+
+                            default:
+                                throw new RuntimeException('対応していないファイル形式です。: ', $type);
+                        }
+
+                        // 新しく描画するキャンバスを作成
+                        $canvas = imagecreatetruecolor($origin_w, $origin_h);
+                        imagecopyresampled($canvas, $origin_image, 0,0,0,0, $origin_w, $origin_h, $origin_w, $origin_h);
+
+                        $filename = date('mdHis').uniqid('_').'.'.$extension;
+                        $files[] = $filename;
+
+                        // 保存先を指定
+                        $resize_path = $this->eccubeConfig['eccube_temp_image_dir'] . '/' . $filename;
+
+                        // 画像形式ごとの処理
+                        switch ($type) {
+                            case IMAGETYPE_JPEG:
+                                imagejpeg($canvas, $resize_path, $this->eccubeConfig->get('eccube_product_image_jpg_quality'));
+                                break;
+
+                            case IMAGETYPE_PNG:
+                                imagepng($canvas, $resize_path, $this->eccubeConfig->get('eccube_product_image_png_quality'));
+                                break;
+
+                            case IMAGETYPE_GIF:
+                                imagegif($canvas, $resize_path);
+                                break;
+                        }
+
+                        imagedestroy($origin_image);
+                        imagedestroy($canvas);
+
+                    } else {
+
+                        $filename = date('mdHis').uniqid('_').'.'.$extension;
+                        $image->move($this->eccubeConfig['eccube_temp_image_dir'], $filename);
+                        $files[] = $filename;
+                    }
                 }
             }
         }