(岡田 伸一郎, b.1966-09-22) Japanese professional player of the Nihon Kiin, pupil of Kato Masao. Promoted 1 dan in 1985, reached 8 dan in 2002 (in the same year he reached 300 wins in his career). 9 dan on 28 May 2021 with 200 wins as 8 dan.
His wife is Okada Yumiko 6 dan.
Nihon Kiin profile.