To reduce wire diameter and cuff loss of a workpiece by forming a layer containing abrasive grains and resin on a wire by electrocoating.

In an abrasive grain fixed wire 1, abrasive grains and resin as a binding agent are formed on a wire rod by electrocoating. Consequently, the wire rod must form positive electrode or negative electrode by the charge of used resin, but for a wire rod of insulating property and unable to form electrode, by plating metallic material on the surface by electroless plating or the like, electrocoating can be made. The wire 1 is wound from one reel bobbin 8 onto the other reel bobbin 9 through a guide roller 5, dancer rollers 6, 7, and working rollers 2, 3, 4. A work W is elevatably moved by a field unit, contacted with the wire 1 running between the lower working rollers 2, 3, and by being pressed, it is cut off into wafers.