diff --git a/yt_dlp/extractor/niconico.py b/yt_dlp/extractor/niconico.py
index e06740d62..961dd0c5e 100644
--- a/yt_dlp/extractor/niconico.py
+++ b/yt_dlp/extractor/niconico.py
@@ -869,7 +869,7 @@ def _real_extract(self, url):
 
 
 class NiconicoUserIE(InfoExtractor):
-    _VALID_URL = r'https?://(?:www\.)?nicovideo\.jp/user/(?P<id>\d+)/?(?:$|[#?])'
+    _VALID_URL = r'https?://(?:www\.)?nicovideo\.jp/user/(?P<id>\d+)(?:/video)?/?(?:$|[#?])'
     _TEST = {
         'url': 'https://www.nicovideo.jp/user/419948',
         'info_dict': {
@@ -877,7 +877,7 @@ class NiconicoUserIE(InfoExtractor):
         },
         'playlist_mincount': 101,
     }
-    _API_URL = 'https://nvapi.nicovideo.jp/v1/users/%s/videos?sortKey=registeredAt&sortOrder=desc&pageSize=%s&page=%s'
+    _API_URL = 'https://nvapi.nicovideo.jp/v2/users/%s/videos?sortKey=registeredAt&sortOrder=desc&pageSize=%s&page=%s'
     _PAGE_SIZE = 100
 
     _API_HEADERS = {
@@ -897,12 +897,13 @@ def _entries(self, list_id):
                 total_count = int_or_none(json_parsed['data'].get('totalCount'))
             for entry in json_parsed['data']['items']:
                 count += 1
-                yield self.url_result('https://www.nicovideo.jp/watch/{}'.format(entry['id']))
+                yield self.url_result(
+                    f'https://www.nicovideo.jp/watch/{entry["essential"]["id"]}', ie=NiconicoIE)
             page_num += 1
 
     def _real_extract(self, url):
         list_id = self._match_id(url)
-        return self.playlist_result(self._entries(list_id), list_id, ie=NiconicoIE.ie_key())
+        return self.playlist_result(self._entries(list_id), list_id)
 
 
 class NiconicoLiveIE(InfoExtractor):