SIDE BOLSTER ADJUSTMENT APPARATUS, SIDE BOLSTER ADJUSTMENT SYSTEM, AND SIDE BOLSTER ADJUSTMENT METHOD FOR VEHICLE SEAT

A side bolster adjustment apparatus of a vehicle seat may include a guide frame which is mounted to a seat back frame, and is formed with a guide groove; a slider which slides along a direction in which a bolster protrudes from a seat back, which is the longitudinal direction of the guide groove, by a guide means formed in the guide groove; a lead screw which is provided to penetrate the slider, and is mounted in the longitudinal direction of the guide groove; a motor which is coupled to the lead screw and selectively rotate the lead screw; and a bolster plate which is coupled to the slider, and rotates around a vertical longitudinal direction of the seat back by operation of the slider.