To provide a cutting method capable of providing a cut work with accurate surface finish by surely separating chips produced by cutting even if the material is a cut material formed of a malleable and ductile metal material to prevent the chips from being twined in a cutter.

A groove part 15 crossing a locus through which the cutter for cutting a work 1 passes is formed in the surface of the work 1 beforehand, and the work 1 is cut with the cutter.