A dresser includes a main body having a stepped surface comprising a plurality of steps, wherein a thickness of the main body at a first step of the plurality of steps is a largest thickness of the main body, and a thickness of the main body at a last step of the plurality of steps is a smallest thickness of the main body; and a plurality of superhard particles disposed on each of the plurality of steps of the stepped surface. The plurality of steps of the stepped surface are different in area, and particle diameters of the superhard particles increase stepwise from the first step of the plurality of steps to the last step of the plurality of steps.