In 1377, he was appointed as Kanto Kanrei (shogunal deputy for the Kanto region) and assisted Kamakura kubo (governor-general of the Kanto region) Ujimitsu ASHIKAGA, who was young at the time, and a year later, he was ordered to be a Shugo of Musashi Province.
1377年には関東管領に任じられて若年の鎌倉公方・足利氏満の補佐に尽力し、翌年には武蔵国の守護に任じられた。