Balloon catheter (10) for prevention of buckling and damaging the balloon (20) by a radiopaque marker member (70, 71, 71) comprising an inner shaft (50). The marker member is arranged on the outer periphery of a coil body (52) having a sparsely wound portion (522) where a wire (521) is sparsely wound, and a distal end part (701) and a proximal end part (702) of the marker member (70) are arranged at a position facing a void (54) formed between adjacent turns of the wire (521) at the sparsely wound portion (522).
