In 1295, his father died, so he succeeded the position of the family head on behalf of his oldest brother Yoriuji SASAKI who set up a new branch of the family, his older brother Noriyori SASAKI who died early, and Mitsunobu SASAKI.
1295年（永仁3年）に父が亡くなり、別家を立てた長兄の佐々木頼氏、早世した兄の佐々木範頼、佐々木満信に代わり家督を継ぐ。