Problem to be solved: to provide a vacuum arc deposition method and apparatus and a rotary cutting tool capable of forming a hard coating excellent in both adhesion to the substrate and surface roughness. The vacuum chamber 1 is provided with a sub chamber 3 which is hard to be evacuated from the film-forming chamber 2, an arc evaporation source 4 is installed in the auxiliary chamber 3, and a gas such as nitrogen gas is introduced into the auxiliary chamber 3 from the gas introducing part 6 during the cleaning of the substrate 10 before the film formation, and the gas pressure in the auxiliary chamber 3 is base When the cathode (evaporation material) of the arc evaporation source 4 is kept higher than the gas pressure around the material 10, and ionized by dissolving the cathode (evaporation material) of the arc evaporation source 4, the generation of the molten particles is suppressed without worsening the sputtering effect, and thus a rotary cutting tool having a small surface roughness can be provided. .
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