diff --git a/app/src/Util/Twig/HtmlHelper.php b/app/src/Util/Twig/HtmlHelper.php
index 850a119f..7148a87f 100644
--- a/app/src/Util/Twig/HtmlHelper.php
+++ b/app/src/Util/Twig/HtmlHelper.php
@@ -25,7 +25,7 @@ function (Request $request, $name, $type, array $attrs = [], array $option_attrs
       ),
       new TwigFunction(
         'url',
-        function (Request $request, string $controller, string $action, array $args = [], $reused = false, $full_url = false) {
+        function (Request $request, string $controller, string $action, array $args = [], $reused = false, $full_url = false, $use_base_dir = true) {
           $args = array_merge(
             [
               'controller' => $controller,
@@ -33,7 +33,7 @@ function (Request $request, string $controller, string $action, array $args = []
             ],
             $args
           );
-          return Html::url($request, $args, $reused, $full_url);
+          return Html::url($request, $args, $reused, $full_url, $use_base_dir);
         },
         ['is_safe' => ['html']]
       ),
diff --git a/app/src/Web/Html.php b/app/src/Web/Html.php
index 9442f8ca..1473a1ab 100644
--- a/app/src/Web/Html.php
+++ b/app/src/Web/Html.php
@@ -19,9 +19,10 @@ class Html
    * @param array $args
    * @param bool $reused
    * @param bool $full_url
+   * @param bool $use_base_dir
    * @return string
    */
-  public static function url(Request $request, $args = array(), $reused = false, $full_url = false)
+  public static function url(Request $request, $args = array(), $reused = false, $full_url = false, $use_base_dir = true)
   {
     // 現在のURLの引数を引き継ぐ
     if ($reused == true) {
@@ -84,7 +85,11 @@ public static function url(Request $request, $args = array(), $reused = false, $
       $params[] = $device_name;
     }
 
-    $url = $request->baseDirectory . Config::get('DIRECTORY_INDEX');
+    if($use_base_dir) {
+      $url = $request->baseDirectory . Config::get('DIRECTORY_INDEX');
+    }else{
+      $url = "/" . Config::get('DIRECTORY_INDEX');
+    }
     if (count($params)) {
       $url .= '?' . implode('&', $params);
     }
diff --git a/app/twig_templates/admin/blog_plugins/plugin_search.twig b/app/twig_templates/admin/blog_plugins/plugin_search.twig
index a881f688..78368880 100644
--- a/app/twig_templates/admin/blog_plugins/plugin_search.twig
+++ b/app/twig_templates/admin/blog_plugins/plugin_search.twig
@@ -30,7 +30,7 @@
                     <a href="{{ url(req, 'blog_plugins', 'download', {id: plugin.id, category: req.get('category'), sig: sig}) }}">{{ _('Download') }}</a>
                 </td>
                 <td class="center">
-                    <a href="{{ url(req, 'Entries', 'preview', {blog_id: blog.id, plugin_id: plugin.id, category: req.get('category'), device_key: 1}, false, true) }}" target="_blank">{{ _('Preview') }}</a>
+                    <a href="{{ url(req, 'Entries', 'preview', {blog_id: blog.id, plugin_id: plugin.id, category: req.get('category'), device_key: 1}, false, true, false) }}" target="_blank">{{ _('Preview') }}</a>
                 </td>
                 <td class="center">
                     {% if user_id == plugin.user_id %}