A self-expandable stent delivery system is disclosed, which is 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. The self-expandable stent delivery system includes an operation unit having a holding portion that holds pull wires so that the pull wires are movable toward the distal side and toward the proximal side, and a switching portion 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.
