This nerve stimulation electrode is provided with: a fixed part formed of an elastic material, the fixed part pressing against the inner surface of a vessel by being placed in the vessel in an elastically deformed state； a first stimulation electrode provided on the fixed part so that only the radially outward side of the fixed part is exposed； a second stimulation electrode for coming into contact with a body fluid in the vessel when placed therein； and leads for connecting the first stimulation electrode and second stimulation electrode to a stimulation generator for generating a nerve stimulation signal for applying electrical stimulation.
