The Nishinotoin was a family of dojo kuge (nobles occupying relatively high ranks) of which the founder was Yukitoki NISHINOTOIN (Sangi (councilor) of Shosanmi (Senior Third Rank)) (1324-1369) in the Northern and Southern Court period, who was 17 generations after TAIRA no Takamune.
平高棟から17世の孫にあたる南北朝時代の西洞院行時（正三位・参議）（1324年-1369年）を祖とする堂上家。