A medical-device position adjusting method includes inserting a guide wire farther forward than a lesion area of the body lumen from the port member； inserting an anchor device into the body lumen and fixing the guide wire to an inner wall surface of the body lumen by the anchor portion at a position farther forward than the lesion area； inserting the medical device from the port member along the guide wire to a position of the lesion area； and fixing the guide wire and the port member with the proximal-end fixing member, causing the guide wire to move in an insertion/pulling-out direction through the operation unit so as to change a path of the guide wire in the body lumen, and adjusting a position of the medical device in the lesion area.
