Abstract: A vehicle seat has a bottom part which is supported by a front leg and a back leg on the vehicle floor. Bottom ends of the legs are mounted pivotably on the vehicle floor and the top ends of the legs are mounted pivotably on the bottom part of the seat. The seat has a seat-adjustment device operable to adjust the seat between two positions in the direction of a seat longitudinal axis running from the back towards the front. This seat-adjustment device has a tube which is mounted pivotably on the vehicle floor, and a rod which is mounted in the tube in such a manner that it can be adjusted in two directions and is pivotably mounted on the bottom part of the seat. The seat-adjustment device has a locking device which fixes the tube and the rod in axial positions relative to one another, which positions are each associated with one of the seat positions.