A power slider includes a lower rail and an upper rail which are engaged with each other so as to be mutually slidable along each other, a screw rod which is rotatably supported on one of the lower rail and the upper rail, a feed nut which is supported on the other of the lower rail and the upper rail and is screw-engaged with the screw rod, and a gearbox which is supported on the one of the lower rail and the upper rail via a holder and which rotatably drives the screw rod. The gearbox is provided with a mounting bolt through-hole and is supported by the holder via a mounting bolt that is inserted through the mounting bolt through-hole. A resilient member is positioned in a space defined between the mounting bolt through-hole of the gearbox and the mounting bolt.