To provide the hard surface in each hard member with a predetermined surface roughness even if grinding a plurality of hard members, in a machining method for grinding the hard surface of the hard member using a grinding wheel.

A hard film in a work W is ground to some degree of surface roughness by first grinding, and the surface roughness after the first grinding is made to a predetermined surface by performing the number of times of grinding paths obtained according to the state difference between the surface roughness and the predetermined surface roughness in a second grinding. Thus, even in the case of grinding the plurality of workpieces W (hard members), the surface roughness of each work W is made close to the predetermined surface roughness.