PURPOSE: To provide an electric discharge machining device, which can easily machine holes in a complex curved surface.

CONSTITUTION: This electric discharge machining device is provided with a first arm 7, which is arranged along plural hole machining parts of an object 2 to be machined having a curved surface and which has holes for electrode guides directed to the hole machining part, plural electrode guides 3, of which tips are respectively inserted for fixation into each electrode guiding hole and which are curved into the predetermined curve so as to hinder the interference with the curved surface, a second arm 8 for fixing the base part of each electrode guide 3, and a flexible electric discharge machining electrode 4a, which is inserted into each electrode guide 3 freely to be slid and of which base end is connected to an electrode holder 1.