Abstract: Vehicle seat has a seat portion and a backrest that includes side wings foldable forwardly onto the seat portion around a backrest swiveling axis to provide a materially horizontal loading area in a cargo position. Adjustment device for flatting the contour of the side wings when the backrest is folded forward onto the seat portion is provided in the side wings. In each side wing, a wing device determines the contour of the side wing with the device swiveling in a longitudinal direction on the backrest frame via a lever mechanism. Backrest can be locked and released when in the use position. A prestressed tension device is connected to the lever mechanism. The tension device exerts tension on the lever mechanism when the backrest is folded forward causing the wing device to swing horizontally inward in the direction of the backrest frame to flatten the contour of the side wings.