PURPOSE: To facilitate the positioning of an electrode as well as to make automatic wire connection ever so easy, by installing each guide part, guiding the wire electrode, at both ends of a guide member, and interconnecting an interval between these guide parts with a hole.

CONSTITUTION: A first guide part 5 consisting of two V-groove-form guides 11 and 12 is installed in an end part at the side of a flange 2 of a guide member 1, in the other end part, there is provided with a second guide part 6 consisting of a die-form guide 13. Both these guide parts 5 and 6 are connected by a hole 7. Since these guide parts are unitized in one, wire connection is so easy, thus positioning for a wire electrode is also easy. That is to say, the wire electrode is supported at four points with these V-grooved guides 11 and 12 so that a position of the wire electrode is set so accurately.