Means(6) are provided for vertical displacement of the seat back(3) and additionally shift the seat back opposite the direction of travel depending upon the force acting upon it. Deformation areas or plastically or elastically deforming elements(7) for reducing the crash energy acting upon the occupant of the seat are provided within the range of travel for displacement of the seat back. For height adjustment and/or rearwards displacement the seat back is connected to a releasable locking unit.
