SEAT LIFTER STRUCTURE AND VEHICLE SEAT EQUIPPED WITH THE SAME

A seat lifter structure which can maintain the engagement of the gear of the sector and the pinion of the brake unit and prevent a fall down of the seat back to a front side, even when a large force to a front side is exerted with respect to the seat back is provided. It raises or lowers a cushion seat (ST) by raising or lowering a side frame () built into the cushion seat (ST) with respect to a fixing member (). It is equipped with a brake unit () having a pinion () and attached to the side frame (); a sector () supported to be rotatable with respect to the fixing member () by a first support portion (), supported to be rotatable with respect to the side frame () via a second support portion (), having a gear portion () to be engaged with the pinion () and provided in parallel and facing with respect to the side frame (); and a spacer () having a first surface () facing with the side frame () and a second surface () facing with the sector (), which is installed between the side frame () and the sector ().