Retractable seat, especially automotive vehicle seat and according vehicle.

The seat (15) has a back support (19) articulated on a base structure (17) around an articulation axis (F-F), and transversally movable with respect to the structure along a sliding axis (E-E) perpendicular to the axis (F-F`). The support is movable between an active position and a retracted position. A locking unit (75) and blocking unit (77) independently block the translation and rotation movements of the support. An independent claim is also included for a motor vehicle having a foldable seat.