After entering Okazaki-jo Castle abandoned by the Imagawa troops, he became independent of the Imagawa clan, intending to restore the right of controlling Mikawa Province that Kiyoyasu MATSUDAIRA, his grandfather, had once established.
今川軍が放棄した岡崎城に入ると、祖父・松平清康の代で確立した三河国の支配権回復を志し、今川氏から独立する。