Disclosed herein is a novel medical wire device which is equipped with a filter unit, capable of surely capturing free embolismic debris upon angioplasty of a constriction lesion in a lumen, capable of easily confirming a developed state of a filter under radiography by a surgeon, and thus improved in function of the filter unit.The medical wire device of the present invention comprises a filter unit which is to be located, upon angioplasty of a constriction lesion in a lumen, on a distal side from the constriction lesion for capturing free embolismic debris separated from an inner wall of the constriction lesion, and a wire provided with the filter unit at its distal-side end. A filter is made up of a metal having radiopaque property.
