Also known as: 長沢義風, 三条道如斎, 五十公野道如斎信宗

Master of Ijimino Castle, he married the younger sister of Shibata Nagaatsu and Shibata Shigeie. He was originally the page of Nagasawa Mitsukuni but came to the attention of Uesugi Kenshin in the capture of Noto and served the Uesugi Clan thereafter as the town magistrate for Sanjou in Echigo.

Nobumune supported Uesugi Kagekatsu in the Otate no Ran after Kenshin's death. Along with his brothers-in-law of the Shibata Clan, he assaulted Kaji Hidetsuna's Kaji Castle and Kanamari Chikatsuna's Sanjou Castle. At Shibata Nagaatsu's sudden death, Shibata Shigeie became the head of the Shibata Clan, and Nobumune became the head of the Ijimino Clan.

He supported his brother-in-law in the Shibata Shigeie Rebellion and turned against Kagekatsu. In October of 1587, during the siege of Ijimino Castle by Naoe Kanetsugu and Fujita Nobuyoshi, etc., he was betrayed by his vassals. The castle fell, and Nobumune was killed.