Workpiece mounting table for electric discharge machine

A workpiece mounting table for an electric discharge machine that machines a workpiece by discharging electricity between an electrode and the workpiece in an interior of a work tank and removing a surface of the workpiece, the workpiece mounting table comprising:

• a surface-plate mounting table, made of a conductive material, arranged at a bottom of the work tank;
• a plurality of insulating materials, each of which has a flat shape and is arranged and fixed on the surface-plate mounting table with a gap between the insulating materials to constitute an insulating flat plate;
• and
• a surface plate, made of a metal material, fixed on the insulating flat plate and insulated from the surface-plate mounting table by the insulating flat plate, for fixing thereon the workpiece,
• wherein the surface-plate mounting table includes a downwardly-recessed discharging shaped portion at a portion corresponding to the gap between the insulating materials.