Abstract: A seat for an automobile or the like includes a seat cushion; a seat back connected to the seat cushion, a space being formed within a lower portion of the seat back; a rod which is pivotably interposed between opposed side frames of the seat back and to one end of which a link plate is secured to an; a hip support secured intermedate portion of the rod and disposed within the space provided within the seat back; an operation handle provided upon one of the side frames; a pinion to which the rotation of the operation handle is transmitted by means of a brake mechanism; and a driven gear pivotably disposed upon onthe same axis as that of the rod and upon the aforenoted side frame for meshing engagement with the pinion, a pivoting end portion thereof being connected to a pivoting end portion of the link plate.