In dividing the Imagawa territory, he and the Takeda clan concluded an agreement that Suruga Province east of the Oi-gawa River should belong to the Takeda clan and Totomi Province in the west to the Tokugawa clan, establishing a friendly relationship.
今川領分割に際して、大井川を境に東の駿河国を武田領、西の遠江国を徳川領とする協定を結んで、武田信玄とは友好関係を築いていた。