A longitudinal adjustment device for a motor vehicle seat, with a floor rail which can be connected to a motor vehicle floor, a seat rail which can be connected to the motor vehicle seat and is mounted in a longitudinally displaceable manner on the floor rail, and a connecting element having a connecting section for connection of a functional component to the seat rail. The connecting element is connected by a first section to a side wall of the seat rail and by a second section to an upper side of the seat rail. The connecting element has an opening for receiving the functional component and/or a bearing element for the arrangement of the functional component. The opening is arranged in the region of a recess running in the region of a bending line between the side wall and the upper side.