APPARATUS FOR ADJUSTING HEIGHT OF SEAT BELT

An apparatus of adjusting the height of a seat belt, which enables the height of a three-point-type seat belt to be adjusted according to the body shape of a child passenger, securing the safety of a child passenger as well as an adult passenger, includes a sliding rail vertically provided on a side of a seatback; and a slider including a belt ring to hang a shoulder belt, wherein the slider is engaged to the sliding rail and configured to vertically slide along the sliding rail, the belt ring being positioned on a top portion of the seatback in a state in which the slider is positioned on an upper end portion of the sliding rail.