A vehicle seat (8) comprises a backrest (7) which consists of an upper and a lower backrest part (14,15). The lower backrest part (15) is connected in an articulated manner both to a seat part (9) and to the upper backrest part (14). By swinging the lower backrest part (15) forwards in the longitudinal direction of the vehicle and the upper backrest part (14) backwards in the longitudinal direction, the vehicle seat (8) is converted into part of a bed.