A lift-up buckle device including a buckle; a lift-up device that includes a coupling portion coupled to the buckle and that moves the buckle from a stowed position to a raised position; a first cover fixed to the lift-up device to cover the coupling portion; and a second cover through which the first cover is inserted, that moves together with the buckle toward a seat upper side. When the buckle is positioned in the raised position, a seat lower side end of the second cover is positioned further toward the lift-up device side than a seat upper side end of the first cover, and an end of the second cover on a seat width direction outside and seat lower side is positioned further toward the lift-up device side than an end of the second cover on a seat width direction inside and seat lower side.