The invention relates to a backrest for vehicle seat, with a head support (1) which is adjustable in terms of height with respect to the backrest, and with a sensor arranged in the head support (1) and intended for detecting the position of the head of a person sitting on the vehicle seat in relation to the head support (1) and for indicating an adjusted end position, in the head support (1) at least two sensors being arranged, designed as capacitive proximity sensors (5, 14), which indicate the position of the head support (1) with respect to the head (P) as a function of the detected capacitances which are to be found as a capacitance on the electrodes formed by the head (P) and one of the at least two proximity sensors (5, 14) each.