Edge trimming method

An edge trimming method for cutting an outer peripheral portion of a workpiece having a chamfered part on the outer peripheral portion, comprising:

• a holding step of holding the workpiece on a holding surface of a chuck table;
• a cut in step of, after the holding step, relatively moving a rotating cutting blade and the chuck table to cause the cutting blade to cut into the outer peripheral portion of the workpiece;
• a cutting step of, after the cut in step, rotating the chuck table and causing the outer peripheral portion of the workpiece to be cut, to form an annular step;
• and
• a moving step of, after the cutting step, moving the cutting blade in a direction of an axis of rotation of the cutting blade to form another annular step adjacent to the first-mentioned annular step,
• wherein the cut in step, the cutting step, and the moving step are repeated in this order, and a stepped oblique region is formed on the outer peripheral portion, with a thickness increasing from an outermost peripheral edge toward an inner side of the workpiece.