PROBLEM TO BE SOLVED: To provide a medical device in which a drive shaft can be easily pulled out from a sheath and which is highly safe.SOLUTION: A medical device 1 comprises: an outer tube 32 provided on a proximal end side of a sheath 2 and provided with an insertion part 37 into which an inner tube 34 is inserted and the inner tube 34 that can move within the outer tube 32 accompanied with movement of a hub 31 and includes a first locking part 341 having an enlarged outside diameter at a distal end part and a second locking part 342 located more on the proximal end side from the first locking part 341 and deformable. The insertion part 37 has a passage port 69 that can receive the inner tube 34. The passage port 69 has a bore diameter smaller than the outside diameters of the first locking part 341 and the second locking part 342, and allows passage of a portion in which the second locking part 342 of the inner tube 34 is arranged, by deformation of the second locking part 342. The inner tube 34 has an easily exposable part 343 in a part located more on the proximal end side from the first locking part 341 and located in the outer tube 32 in a state where the second locking part 342 is locked by the passage port 69.
