Abstract: The seat for a vehicle which is preferably intended to be used with a seat belt capable of assuming an active position in which it is able to keep an occupant in his seat with the aid of a strap (S) held by at least one anchoring point (A), and which comprises a seat part (10) with a cushion (11) carried by a framework (12) mounted on a subframe (14), a backrest (20) with a cushion (21) carried by a framework (22), characterized in that the framework (12) of the seat part (10) cushion (11) is mounted on the subframe (14) by interposition of a turntable (13) so that the seat part (10) cushion (11) can rotate about an axis (130) between a normal position and a turned access position and in that an anchoring point (A) of the strap (S) of the seat belt is placed, directly or indirectly, on the framework (12) of the seat part (10) cushion (11).Application to land-based motor vehicles.