In 1558, Tadamoto celebrated his attainment of manhood and got the rank of Shogoinoge (Senior Fifth Rank, Lower Grade), then in 1560, he was promoted to Jusanmi (Junior Third Rank).
弘治(日本)4年（1558年）元服、正五位下に叙され、永禄3年（1560年）には従三位に進んだ。