PURPOSE:To reduce roughness of a work face for surface processing by compounding light cutting by grinding grains held in a viscous and elastic body and electrolytic processing in solution of oxysalt. CONSTITUTION:A viscous and elastic body 4 such as nonwoven fabric, porous urethane and the like is pasted on a negative electrode 6 and grinding grains 5 are stuck to said body 4. Water solution of oxysalt such as sodium nitrate and the like is supplied to a work part and the negative electrode 6 is relatively moved in the direction of an arrow 8 while being pressed down on a workpiece 1. Such D.C. voltages as to make the workpiece 1 and the negative electrode 6 respectively positive and negative are applied and electrolytic processing is performed, however, an inactivating film is produced on the surface of the workpiece 1 acting as a positive electrode subsequently electrolytic processing is stopped. The inactivating film on the convex part of the workpiece 1 is removed by cutting action of grinding grains 5, and the electrolytic processing is concentrated on the convex part. Thus, the work surface of small roughness can be processed in a short time.
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