Abstract: A power supply circuit for discharge machining comprising a first switching means for supplying a d-c power voltage to a discharge gap between a discharge machining electrode and a workpiece, a first energy consumption circuit having a second switching means provided on the output side of the first switching means, and a second energy consumption circuit having a third switching means provided in the vicinity of the discharge gap in parallel therewith, in which the second switching means of the first energy consumption circuit and the third switching means of the second energy consumption circuit are caused to conduct after the first switching means is turned off.