Provided is a multiple-electrode monorail guide catheter for use in vascular insertion, including: an elongated catheter main body having a proximal end and a distal end a guidewire inlet opening on the distal end a guidewire outlet opening an operation tube a terminal unit on the proximal end an electrode assembly having a double-lumen structure composed of an outer tube having electrodes on an outer surface of the outer tube and an inner tube independently provided from the outer tube, allowing insertion of a guidewire, having an outer diameter smaller than an inner diameter of the outer tube, and being accommodated within an outer tube lumen a clearance defined by the outer tube luminal surface and an inner tube outer circumferential surface and lead wires extending from the electrodes to the terminal unit on the proximal end and being inserted into the lumen of the outer tube.
