Abstract: A machining electrode (30) having a circular shape in plan view and an outer diameter equal to or larger than an outer diameter of a workpiece is positioned above the workpiece so that the machining electrode (30) partially overlaps the workpiece in plan view. The workpiece is rotated about a first central axis (X1); the machining electrode (30) is rotated about a second central axis (X2); and discharge is caused between the machining electrode (30) and the workpiece with both the workpiece and the machining electrode (30) being rotated.

Abstract: Provided is a wire electric discharge machining device which machines a workpiece by electric discharge between a wire and the workpiece, the wire electric discharge machining device includes a jig holding the workpiece, and a cover layer disposed in a fixing part of the jig that faces the workpiece, the cover layer corresponds to a sheet having conductivity and also having an adhesive property to adhere to the workpiece and the jig, and the sheet includes a conductive layer formed of a copper foil, and a conductive adhesive layer combined with this conductive layer.