A slide rail of a vehicle seat includes a first rail to which a screw having a screw thread formed on an outer periphery is fixed, and a second rail that retains a nut into which the screw screws, and moves relative to the first rail by the nut rotating. The first rail has a through-hole into which the screw is inserted. At least one end of the screw has a deformed portion that is deformed toward an outside in a radial direction of the screw with respect to the first rail while the at least one end of the screw is in a state passing through the through-hole, and that keeps the screw from slipping out of the through-hole.