[Problem] To provide a medical device that can perform plural actions by a single operation and is excellent in operability. [Solving Means] The present invention provides a medical device including a catheter 1 that is inserted into a living body, a sandwiching portion 20 and a needle positioning portion 61 that are disposed in the catheter 1 so as to be able to advance and retract, a slide portion 100 that can be operated such that the sandwiching portion 20 and the needle positioning portion 61 advance and retract simultaneously, and an action switching portion 130 that causes the sandwiching portion 20 to advance and retract in tandem with or independently of the slide portion 100 by the advance and retraction of the slide portion 100.
