PROBLEM TO BE SOLVED: To easily insert a medical device having a biasing member for elastically pressing an inner wall of a blood vessel in the inside of a body of a patient, and to easily extract the medical device from the inside of the body of the patient by storing the medical device in an extraction sheath to be extracted after a treatment, in a medical device set.SOLUTION: A medical device set 100 includes: an electrical stimulation electrode 1 which has a lead part 20 and an electrode support body 25 arranged in a distal end part of the lead part 20 for elastically pressing an inner wall of a blood vessel and is configured that a part of the lead part 20 and the electrode support body 25 are arranged inside the blood vessel； an operation sheath 50 having a sheath body 51 into which the lead part 20 is inserted inside thereof and an engaging part 53 detachably engaging with a distal end part of the electrical stimulation electrode 1； and an extraction sheath 60 which has a sheath body 61 into which the sheath body 51 is inserted inside thereof and which is arranged to be relatively movable with respect to the operation sheath 50 in a longitudinal direction of the operation sheath 50.SELECTED DRAWING: Figure 1
