A standing aid for supporting a person and relieving leg fatigue while standing on a riser step. The standing aid comprises a seat capable of supporting a person standing on the riser step, a vertical stand having a top end secured to the seat and a mounting system secured to a bottom end of the vertical stand. The mounting system has a clamp having a first surface for extending over and in contact with a top surface of the riser step and a second surface for extending below and in contact with a bottom surface of the riser step. The first surface of the mounting system has a relatively small footprint in that it has a second predetermined width which is less than the first predetermined width of the riser step. This small footprint allows people to maneuver around the standing aid while moving on and off the riser step.