In 1583, when the Battle of Shizugatake ended, he became a daimyo (Japanese feudal lord), the lord of the Sumoto-jo Castle of Awaji Province with 50,000 koku of rice as a result of what Hidehisa had contributed.
天正11年（1583年）に賤ヶ岳の戦いが終結すると、秀久はこれまでの功を評価され、淡路国洲本城主5万石の大名となる。