diff --git a/plugins/baser-core/src/Service/ThemesService.php b/plugins/baser-core/src/Service/ThemesService.php
index e60a5eaeb8..682d445b80 100644
--- a/plugins/baser-core/src/Service/ThemesService.php
+++ b/plugins/baser-core/src/Service/ThemesService.php
@@ -399,6 +399,8 @@ public function copy(string $theme): bool
         }
         BcUtil::changePluginClassName($oldTheme, $newTheme);
         BcUtil::changePluginNameSpace($newTheme);
+        BcUtil::changeHelperClassName($oldTheme,$newTheme);
+        BcUtil::changeHelperNameSpace($newTheme);
         return true;
     }
 
diff --git a/plugins/baser-core/src/Utility/BcUtil.php b/plugins/baser-core/src/Utility/BcUtil.php
index c48cb7623c..f3e16957e3 100644
--- a/plugins/baser-core/src/Utility/BcUtil.php
+++ b/plugins/baser-core/src/Utility/BcUtil.php
@@ -1852,6 +1852,59 @@ public static function changePluginClassName(string $oldPlugin, string $newPlugi
         return true;
     }
 
+    /**
+     * ヘルパーのnamespaceを書き換える
+     * @param $newPlugin
+     * @return bool
+     * @checked
+     * @noTodo
+     * @unitTest
+     */
+    public static function changeHelperNameSpace($newPlugin)
+    {
+        $pluginPath = BcUtil::getPluginPath($newPlugin);
+        if (!$pluginPath) return false;
+        if(file_exists($pluginPath . 'src/view/helper' . DS . 'Helper.php')) {
+           $helperClassPath = $pluginPath . 'stc/view/helper' . DS . $newPlugin . 'Helper.php';
+        }elseif (file_exists($pluginPath . 'src/view/helper' . DS . $newPlugin . 'Helper.php')) {
+           $helperClassPath = $pluginPath . 'src/view/helper' . DS . $newPlugin . 'Helper.php';
+        }else{
+           return false;
+        }
+        $file = new BcFile($helperClassPath);
+        $data = $file->read();
+        $file->write(preg_replace('/namespace .+?;/', 'namespace ' . $newPlugin . '\View\Helper;', $data));
+        return true;
+    }
+
+    /**
+      * へルパーのクラス名を変更する
+      * @param string $oldPlugin
+      * @param string $newPlugin
+      * @return bool
+      */
+      public static function changeHelperClassName(string $oldPlugin, string $newPlugin)
+      {
+          $pluginPath = BcUtil::getPluginPath($newPlugin);
+          if (!$pluginPath) return false;
+          $oldTypePath = $pluginPath . 'src/View/Helper' . DS . 'helper.php';
+          $oldPath = $pluginPath . 'src/view/Helper' . DS . $oldPlugin . 'Helper.php';
+          $newPath = $pluginPath . 'src/view/Helper' . DS . $newPlugin . 'Helper.php';
+          if(!file_exists($newPath)) {
+              if(file_exists($oldTypePath)) {
+                  rename($oldTypePath, $newPath);
+              } elseif(file_exists($oldPath)) {
+                  rename($oldPath, $newPath);
+              } else {
+                  return false;
+              }
+          }
+          $file = new BcFile($newPath);
+          $data = $file->read();
+          $file->write(preg_replace('/class\s+.*?Helper/', 'class ' . $newPlugin . 'Helper', $data));
+          return true;
+      }
+
     /**
      * httpからのフルURLを取得する
      *