In 1704, with the promotion in official rank of Ienobu TOKUGAWA, the successor of the Tokugawa Shogun family, Sadanao was appointed Shogunate messenger to Kyoto and promoted to jiju.
宝永元年（1704年）、徳川将軍家世嗣徳川家宣の官位昇進のため、京都御使を命ぜられ侍従に昇進する。