Dressing method of cutting blade

A dressing method of a cutting blade in which a plate-shaped dressing board is cut by the cutting blade mounted to a spindle and the cutting blade is shaped to reduce a region of roundness at a tip of the cutting blade, the dressing method comprising:

• a first cutting step of causing the cutting blade to cut into the dressing board held by a holding surface of a chuck table with a cutting depth that does not surpass a length of the region of roundness in a radial direction of the cutting blade, and relatively moving the chuck table and the cutting blade in a direction that is parallel to the holding surface and is perpendicular to an axial center of the spindle to form a cut groove in the dressing board;
• and
• a second cutting step of causing the cutting blade to further cut into a groove bottom of the cut groove formed in the first cutting step with a cutting depth that does not surpass the length of the region of roundness in the radial direction of the cutting blade, and relatively moving the chuck table and the cutting blade in the direction that is parallel to the holding surface and is perpendicular to the axial center of the spindle to carry out cutting on the groove bottom with tracing of the cut groove.