In the same year, at the Kiyosu conference for deciding a successor of the Oda family, he and Hideyoshi supported the Nobunaga's heir Sanboshi (Hidenobu ODA) in opposition to Katsuie SHIBATA and others; and in the following year, he fought against Katsuie in the Battle of Shizugatake and in 1583, he was given 130000 koku in Mino Province and became the Ogaki-jo Castellan.
同年、織田家の後継を巡る清洲会議では、柴田勝家らに対抗して、秀吉とともに信長嫡孫の三法師(織田秀信)を擁立、翌年には賤ヶ岳の戦いで勝家と戦い、天正11年（1583年）、美濃国にて13万石を拝領し大垣城主となる。