Seat cushion for vehicle seat unit

A seat cushion (1) for a vehicle seat unit comprising a cushioning pad (2) upholstered with a seat covering (3) and a flexible but inelastic planar film (8; 24) with an electrically conductive element buried therein that is disposed between the cushioning pad (2) and the seat covering (3). The cushioning pad (2) has tuck-in grooves (4, 5) in which the seat covering (3) is locally retained. The planar film (8, 24) is thickened at locations where the planar film (8; 24) transverses the tuck-in grooves (4, 5) for reinforcement.