Abstract: A resistance regulator for a magnetic brake includes a resistance-designating mark unit and an indicator, which can rotate relative to each other so as to move a pull rope that is adapted to be connected to the brake. The mark unit has a small-resistance mark and a plurality of equidistant large-resistance marks. The indicator is directed toward a selected one of the large-resistance and small-resistance marks. Each adjacent pair of the large-resistance marks are spaced apart from each other at a distance that is smaller than the distance between the small-resistance mark and a leading one of the large-resistance marks.