Tadamori was rewarded Jushiinoge (Junior Fourth Rank, Lower Grade) in 1127 and also became the Govenor of Bizen Province and was appointed for the position of Sama no gon no kami (Provisional Captain of Samaryo, Left Division of Bureau of Horses).
大治2年（1127年）従四位下に叙され、備前国守となり左馬権頭も兼ねた。