Processing method for workpiece

A processing method for a disk-shaped workpiece having a first circular side and a second circular side, the processing method being applied when processing an outer peripheral portion of the workpiece and comprising:

• a holding step of holding the workpiece at the second circular side thereof such that the workpiece is exposed at the first circular side thereof;
• and
• a cutting step of, after the holding step, with an annular cutting blade including a first annular cutting edge portion and a second annular cutting edge portion that is less prone to consumption than the first annular cutting edge portion kept rotating, allowing the first annular cutting edge portion to cut into a first region of the outer peripheral portion and also allowing the second annular cutting edge portion to cut into a second region of the outer peripheral portion, the second region being located on an outer side, in a radial direction of the workpiece, of the first region, and moving the cutting blade relative to and along the outer peripheral portion of the workpiece, whereby the outer peripheral portion of the workpiece is cut.