In order to extend the range of application and in order to improve the belt guidance in a child' s seat (3, 4) which is located in the luggage space (6) of an estate car, points backwards and has a head rest (2) which extends over the entire width of the back rest, it is proposed to mount the head rest (2) in two holders (11) which are attached or formed onto the side elements (1) of the back rest, which holders (11) simultaneously hold the upper attachment point or deflection point (14) for an oblique shoulder strap (13).