To reduce electric discharge machining cost by ensuring necessary strength of a machining electrode while ensuring a sufficient projection degree of the machining electrode and by reducing the frequency of replacement of the machining electrode.
An electric discharge machining device comprises the bar-shaped machining electrode 21, a chuck 22a for holding the machining electrode 21, a head driving and positioning mechanism 24 for moving the chuck 22a to position the machining electrode 21, and an electrode shaping wire electric discharge unit 30 having an electric discharge machining wire 31 and for removing a tip periphery portion 21a of the machining electrode 21 by electric discharge when the wire 31 is near the tip periphery portion 21a of the machining electrode 21.
IWATA TAMOTSU
KUBO KAZUHIKO
