In 1590, he served Hideyoshi TOYOTOMI who was trying to establish himself as ruler of the country after the conquest and siege of Odawara, was approved of the main domain, lived in Yamagata-jo Castle and had a fief of 240,000 koku.
1590年(天正18)に覇業を推し進める豊臣秀吉の小田原征伐を機に臣従、本領を安堵され、山形城を居城にして24万石を領する。