No one had been appointed as either a regent or a chancellor for a long time after Mototsune's death, but considering the Emperor's youth, Tadahira was appointed as a regent when Emperor Suzaku (the son of his sister, FUJIWARA no Onshi) succeeded to the throne in 930.
延長8年（930年）に朱雀天皇（姉の藤原穏子の子）が即位すると、基経の没後は長く摂政関白が置かれなかったが新帝が幼少であるため摂政に任じられた。