PURPOSE:To prevent the elution of the metal and alloy which possess easy electrolytic elution characteristic by applying the negative-electrode voltage pulses in the repose time between the positive-electrode voltage pulses and setting the average working voltage to 0V or less. CONSTITUTION:A monostable circuit 10 generates output pulses from the starting-up of the output pulses of an oscillator 9, and a switching element 5 is turned-ON for the time width. The positive-electrode voltage pulses are applied between a wire electrode 1 and a workpiece 2 by a positive-electrode power source 3. When the output pulses (b) of the monostable circuit 10 become- OFF, the output of a reversal circuit 11 becomes-ON, and the output pulses of a monostable circuit 12 are outputted from the starting-up. Therefore, a switching element 8 is turned-ON, and the negative-electrode voltage pulses are applied between the wire electrode 1 and the workpiece 2 by a negative- electrode power source 6.
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