To provide a rotator having excellent fatigue strength and long service life which uses metallic sheets having a lap fillet-welded joint, a cold-bend working part, a punch-out hole, etc., receiving repeated loads with the rotation, such as load-wheel for car, pulley, gear, driving wheel in caterpillar.

In the rotator having the lap fillet-welded joint welding the edge parts by piling up two metallic sheets, cold-bend working part, punch-out hole, etc., a pressed trace is formed or the surface is smoothened by applying an ultrasonic shock treatment to anyone, and a tension residual stress is relaxed to obtain the rotator having excellent fatigue strength and long service life, and its producing method.