[Object] To provide a self-expandable stent delivery system configured to be capable of moving a pull wire toward a distal side and toward a proximal side to achieve a further improvement of the operability. [Solving Means] An operation unit 100 includes a holding portion 200 that holds pull wires 50a, 50b so that the pull wires 50a, 50b are movable toward the distal side and toward the proximal side, and a switching portion 300 configured to be capable of switching between limitation of movement of the pull wires held by the holding portion toward the distal side and release of the limitation.
