To save labor as against a conventional way in which ceramic coating is applied after perforation is carried out and to prevent generation of a crack, which may be caused when perforation is carried out in a ceramic coating layer, a bond coating layer, and a blade base member at a stroke by means of laser beam machining, in the blade base member in the vicinity of a cooling hole.

After a ceramic coating layer 3 in the place in which a cooling hole is arranged is removed by means of shot blasting, electric discharge machining is applied to an exposed bond coating layer 2 in this place and a blade base member 1, and then, a through hole serving as a cooling hole is formed. In this way, a crack, which was conventionally caused in the blade member 1 around the cooling hole when laser beam machining was carried out, is prevented, so that a sound and precise cooling hole can be provided with ease.