7th head of the Satomi Clan; various accounts say he is either son of the 6th head Satomi Yoshihiro or son of 5th head Satomi Yoshitaka. He and Yoshihiro's son Satomi Yoshishige were joint heirs to Yoshihiro.

He achieved peace with the Houjou Clan in 1577 and married Houjou Ujimasa's daughter Lady Tsuru. When Lady Tsuru died two years later, he married Ujimasa's younger sister Lady Kiku. When Yoshihiro died in 1578, he forced Yoshishige out of the clan and took over his territories with Houjou's support.