An object of the present invention is to provide a method for cutting a workpiece capable of accurately aligning a cutting position. The present invention provides a chuck table, a cutting means for cutting a workpiece with a cutting blade fixed to the spindle, a moving means for relatively moving the chuck table and the cutting means in the perpendicular X and Y directions, and an optical system in which a reference line is formed. A cutting method of a cutting device having an imaging means and a control means, comprising: a dressing step of dressing a cutting blade at a first spindle rotation speed, and a dressing board at a second spindle rotation speed before or after the dressing step. A groove forming step of forming a groove for positioning by cutting abnormally, a reference distance registration step of registering the distance between the groove for positioning and a reference line, and a cutting position in which the cutting position is set by matching the reference line to the line to be divided of the workpiece And a setting step and a cutting step of cutting the workpiece at a second spindle rotation speed.
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