diff --git a/src/Parsers/BBCode/Tags/VideoTag.php b/src/Parsers/BBCode/Tags/VideoTag.php
index 5f39a584..6e8b538c 100644
--- a/src/Parsers/BBCode/Tags/VideoTag.php
+++ b/src/Parsers/BBCode/Tags/VideoTag.php
@@ -5,9 +5,11 @@ use Misuzu\Parsers\BBCode\BBCodeTag;
 
 final class VideoTag extends BBCodeTag
 {
-    private const YOUTUBE_URL_REGEX = '#^(?:www\.)?youtube(?:-nocookie)?\.(?:[a-z]{2,63})$#u';
+    private const YOUTUBE_REGEX = '#^(?:www\.)?youtube(?:-nocookie)?\.(?:[a-z]{2,63})$#u';
     private const YOUTUBE_EMBED = '<iframe width="560" height="315" src="https://www.youtube-nocookie.com/embed/%s?rel=0" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>';
 
+    private const NICODOUGA_EMBED = '<script async type="application/javascript" src="https://embed.nicovideo.jp/watch/%1$s/script?w=560&h=315" width="560" height="315"></script><noscript><a href="https://www.nicovideo.jp/watch/%1$s">Embedded Video</a></noscript>';
+
     public function parseText(string $text): string
     {
         return preg_replace_callback(
@@ -27,7 +29,7 @@ final class VideoTag extends BBCodeTag
                     return sprintf(self::YOUTUBE_EMBED, $url['path']);
                 }
 
-                if (!empty($url['query']) && ($url['path'] ?? '') === '/watch' && preg_match(self::YOUTUBE_URL_REGEX, $url['host'])) {
+                if (!empty($url['query']) && ($url['path'] ?? '') === '/watch' && preg_match(self::YOUTUBE_REGEX, $url['host'])) {
                     parse_str(html_entity_decode($url['query']), $ytQuery);
 
                     if (!empty($ytQuery['v']) && preg_match('#^([a-zA-Z0-9_-]+)$#u', $ytQuery['v'])) {
@@ -35,6 +37,14 @@ final class VideoTag extends BBCodeTag
                     }
                 }
 
+                if ($url['host'] === 'nicovideo.jp' || $url['host'] === 'www.nicovideo.jp') {
+                    $splitPath = explode('/', trim($url['path'], '/'));
+
+                    if (count($splitPath) > 1 && $splitPath[0] === 'watch') {
+                        return sprintf(self::NICODOUGA_EMBED, $splitPath[1]);
+                    }
+                }
+
                 $mediaUrl = url_proxy_media($matches[1]);
                 return sprintf('<video controls src="%s" style="max-width:100%%;max-height:100%%;"></video>', $mediaUrl);
             },