In 1198, the abdication of the Emperor Gotoba and enthronement of the Imperial Prince Tamehito, who was a grandson of Michichika, were realized, and Michichika, who became the maternal grandfather of the new emperor, the Emperor Tsuchimikado concurrently assumed the positions of Dainagon (chief councilor of state) and Innocho Betto (chief administrator of the Retired Emperor's Office).
建久9年（1198年）、後鳥羽天皇の退位と通親の孫である為仁親王の即位が実現して、新帝・土御門天皇の外祖父となった通親は大納言と院庁別当を兼任することになった。