Motor vehicle with a second-row seat having a backrest and sitting surface that can both be tipped over

The second-row seat (1) comprises a backrest (3) that can be tipped down about a first fixed hinge (4) to form a resting surface (7), and a sitting surface (2) having a front portion (9), designed to be tipped forwards about a second fixed hinge (12) set in a position corresponding to a front portion (9) thereof. This is moreover hinged with a rear portion (16) of the sitting surface (2) by means of a mobile hinge (17), for folding the sitting surface (2) so as to form a prolongation (18) of the resting surface (7). The two portions (9, 16) have corresponding bottom surfaces (19, 26), in a position corresponding to which is set the mobile hinge (17). The prolongation (18) of the resting surface (7) is constituted by two transverse surfaces (21, 27) carried by the two portions (9, 16) of the sitting surface (2).