In 1760, remaining heyazumi (an adult-age eldest son who has yet to come into his inheritance), he was appointed Rekisaku sokuryo goyo (an official in charge of making a calendar and surveying of land) to support his father with Yasusuke TOITA and Hoshi FUNAYAMA.
宝暦10年（1760年）に部屋住みのまま暦作測量御用に任じられて、戸板保佑・船山輔之とともに父を補佐した。