A motor-vehicle seat, in particular a rear motor-vehicle seat, includes a backrest frame having an upper cross-member, and a headrest connected to the upper cross-member and tiltable between an upright operative position and an inoperative position rotated forwardly relative to the operative position. The headrest is rotatably mounted on the upper cross-member of the backrest frame, whereby it is adapted to tilt between its operative and inoperative positions around a transversal axis which is vertically located substantially at the same height of the cross-member.