A medical device is disclosed for cutting an object in a body lumen, including: a rotation structure which includes a cutting portion; a first shaft which is connected to a center shaft of the rotation structure and drives the rotation of the rotation structure; and a second shaft which is formed in a tubular shape surrounding the first shaft, wherein the second shaft is bendable at two positions including a first curved portion and a second curved portion located more distal than the first curved portion, and the second shaft is rotatable in a state in which a proximal side of the first curved portion and a distal side of the second curved portion of the second shaft are kept substantially parallel to each other.