A plating layer 18 of Ni or the like is formed around the outer peripheral face 14 of a wire tool 10, and super abrasive grains 16 are electrodeposited so as to be embedded in the plating layer 18. A coating layer 20 is formed on the surface of the super abrasive grains 16 to increase efficiency during electrodeposition. The thickness of the coating layer 20 formed on the super abrasive grains 16 is less than 0.1 μm, and preferably not more than 0.05 μm. The coating layer 20 is thin enough that its mass is less than 10% of the mass of the super abrasive grain 16. Accordingly, the super abrasive grains 16 are electrodeposited in a single layer around the outer peripheral face 14 of the core wire 12. As a result, the super abrasive grains 16 do not readily come off the core wire 12, which means that the wire tool will have a longer life. Also, since there is no need to remove any excess super abrasive grains after their electrodeposition, manufacturing costs can be cut and less work is entailed.