At the Kiyosu conference after the conquest of Mitsuhide AKECHI, when a fight for power of the Oda family occurred between Katsuie SHIBATA and Hideyoshi HASHIBA, Narimasa took side of Shibata, but he could not participate in the battle of Shizugatake since he could not leave Ecchu due to preparations for the attack of the Uesugi army.
明智光秀征伐後の清洲会議において、柴田勝家と羽柴秀吉との織田家の実権争いが勃発すると、成政は柴田方につくが、賤ヶ岳の戦いには上杉軍への備えのため越中を動けず、本人は合戦に参加出来なかった。