PURPOSE: To easily manufacture a flexible electrode guide with a high degree of accuracy by securing a microparticle coating layer made of hard materials, on the outer surface of a core member so as to form a stock of an electrode guide, by processing the external shape of the stock to remove the core member and by lapping the bore of the guide.

CONSTITUTION: A coating layer 52a made of diamond microparticles is formed on the outer surface of an aluminum core member 53 over a length of (l) through the intermediary of an adhesive film 54. The outer surface of the core member 53 is subjected to application of electrical conductivity over a length slightly longer than that of an electrode guide while the remaining part is coated thereon with an insulating film, Further, an electro-deposition layer is successively accumulated on the outer surface of the coating layer 52a so as to form a stock of the electrode guide. Further, the external shape of the stock is processed coaxially with the core member 53 so as to radially form four axial grooves, and thereafter the core member 53 is removed. After insertion of a thin lapping wire, lapping is made while a lapping powder such as diamond or the like is fed so as to complete the electrode guide. Thus, it is possible to easily manufacture flexible electrode guides capable of expecting electric discharge processing with a high degree of accuracy.