PURPOSE: To manufacture an inexpensive die low in electrode cost by covering a model surface conforming with the forming surface of a die with conductive material and using coated model as an electrode to carry out electric discharge machining.

CONSTITUTION: A model such as wooden pattern is manufactured and a reverse model of this pattern is made from material such as silicone resin, etc. A further reverse mold of plaster, etc., is made from the reverse model of silicon resin, etc., and a material wherein Fe powder and organic binder, etc., are blended in a slurry state is poured in this plaster mold to be transferred and formed from plaster, etc. This is dried and sintered to obtain die material for carrying out electric discharge machining. On one hand, the electrode is made by coopering the formed surface of the wooden pattern. In that case, water proofing is carried out by thermosetting resin, etc., such as epoxy resin on the wooden pattern, electroless plating such as nickel is carried out on it and copper plating is carried out by electroplating, etc., on it. Then, electric discharge machining is carried out on the formed surface as a conventional manner.