He has been serving as retainer for three generations of the Imagawa clan: Ujiteru IMAGAWA, Yoshimoto IMAGAWA and Ujizane IMAGAWA and acted as Sunpu zaibanshu (castle guards of Sunpu), also fought in various regions following the Imagawa clan's military tactics, then Ujizane IMAGAWA gave him a position of Daikanshiki (a local administrator) in 1559.
今川氏輝、今川義元、今川氏真3代にわたり家臣として仕え、駿府在番衆を務めたほか、今川氏の軍略に従い各地を転戦し、永禄2年（1559年）には今川氏真から代官職を与えられている。