Vehicle seat with foreward tilting backrest

The seat comprises a seat part (3a,3b) and a back (2a,2b) which pivots relative to the seat part about a horizontal axis (X) by means of an articulation (4) between a raised use position, a shelf position and an intermediate pulled down position. The seat comprises first (5), second (28) and third (35) separate control parts connecting the seat part to the back.