An automotive seat having a seat belt buckle holder is disclosed, which includes a seatback part having a pad covered with an outer skin member, and a seat belt assembly having a belt equipped with a buckle. The pad is partially cut away to form a rectangular recess which is so sized as to accommodate the buckle. The outer skin member is cut in L-shape for providing the outer skin member with an openable part. The openable part is detachably fastened, by means of a fastener, to the pad.