Tadatsuna successively held various posts, including Tajima no kuni no kami (Governor of Tajima Province), Omi no kuni no kami (Governor of Omi Province), and Togubo (Crown Prince's Quarters), and eventually rose to the rank of Shoshiinoge (Senior Fourth Rank, Lower Grade).
但馬国守・近江国守・春宮坊などを歴任し、正四位下に至った。