It is considered that he served Ieyasu from the beginning and became hatamoto (direct retainer of the shogun) of Ieyasu, in accordance with his father Yukinaga TOJO's conversion from the Toyotomi family to the Tokugawa family.
父東条行長が豊臣家から徳川家に転じたのに伴い、当初から家康に仕え、家康の旗本になったとされる。