Motor vehicle seat with a seat support with a depth adjustment of the seat

The invention relates to a motor vehicle seat with a seat support (20) consists of two parts, namely a front portion (34) and a rear portion (36) which are interconnected via two lateral junction zones (38), and that for the seat depth adjustment, the side of junction zones (38) have respectively a slot (40) in which is guided a pin (peg axial 42) and that there is a device (48) for moving and the mechanical fixing of the two parts (34, 36) one against the other.