Patent attributes
A movable rail is slidable relative to a fixed rail and supports a seat. A projection protrudes towards the seat from an upper surface of the movable rail that faces the seat and fixes the seat to the movable rail. A rail cover is elastic, and configured to cover the upper surface of the movable rail. The rail cover extends in a direction parallel to a longitudinal axis of the fixed rail and comprises a slit that allows the projection to pass through. A spacer plate having a strip shape is attached to the upper surface of the movable rail and extends in a direction parallel to a longitudinal axis of the movable rail, and is configured to comprise a through-hole for the projection to pass through.