SEAT BACKREST FOR A MOTOR VEHICLE

A seat backrest (1) for a motor vehicle has a structure (2), which supports a padding (3) covered by a cover (4); the structure (2) has a rear plate (9) provided with a coupling portion (15), to which an end of the cover (4) is fixed along a peripheral edge (12) of the plate (9) itself; the plate (9) is fixed to a front frame (25) by means of a snap-on connecting device (30) having a plurality of deformable appendages (36), which are carried by the plate (9) in positions that are spaced apart from one another; the appendages (36) are part of respective brackets (43), which are fixed to the plate (9) and have respective stiffening portions (45), which are arranged at the coupling portion (15).