Core moving device of wire electric discharge machine

A core moving device of a wire electric discharge machine, comprising:

• a core adsorption holding part which adsorbs a core cut out of a workpiece with a magnetic force of a magnet and moves the core relative to the workpiece,
• wherein the core adsorption holding part comprises:
• a rod member, at least a distal end portion of which is constituted of the magnet;
• a bottomed cylindrical member which has a bottom surface on a distal end portion side and into which the rod member is inserted from a base end portion side, wherein the bottomed cylindrical member, on one hand, moves backward relative to the rod member to the base end portion side of the rod member to be capable of adsorbing the core with the magnetic force of the magnet and, on the other hand, moves forward relative to the rod member to the distal end portion side of the rod member to be capable of pushing out and removing the core adsorbed by the magnetic force of the magnet against the magnetic force;
• a cylindrical member drive part which moves the bottomed cylindrical member forward relative to the rod member to at least the distal end portion side of the rod member;
• and
• a core adsorption detector which detects whether a position of the bottomed cylindrical member with respect to the rod member is at a position when the core is adsorbed to the core adsorption holding part by the magnetic force of the magnet.