A medical electrical stimulation electrode includes a lead portion, an electrode portion and a wiring portion, wherein the electrode portion includes a proximal end tip, an elastic wire, and a nerve stimulation electrode, and the elastic wire is connected to the proximal end tip , And the proximal bulging portion extending in a direction intersecting the extension line in a plane including the extension line in which the center line of the lead portion extends further distally from the distal end of the lead portion and the proximal bulging portion , The distal end of the proximal bulge is connected to the proximal end and is inclined with respect to the plane containing both the distal end of the proximal bulge and the extension line and is closer to approaching away from the extension An inclined portion extending further distally from the distal end of the bulging portion, an intermediate line connected to the distal end of the inclined portion, an inclined portion connected to the distal end of the intermediate line portion, And a distal bulging portion extending in a direction intersecting the extension line in a plane including both the distal end of the portion and the extension line Eteiru.医療用電気刺激電極は、リード部と、電極部と配線部とを備え、前記電極部は近位端チップと、弾性ワイヤと、神経刺激電極とを備え、弾性ワイヤは、前記近位端チップに固定され、且つ、リード部の中心線がリード部の遠位端からさらに遠位側へ延びてなる延長線が含まれる面内においてその延長線に交差する方向へ延びる近位膨出部と、近位膨出部の遠位端に近位端が接続され近位膨出部の遠位端と延長線とがともに含まれる面に対して傾斜し且つ延長線から離れる方向へ向かって近位膨出部の遠位端からさらに遠位側へ延びる傾斜部と、傾斜部の遠位端に接続された中間線部と、中間線部の遠位端に接続された傾斜部と、傾斜部の遠位端と前記延長線がともに含まれる面内において前記延長線に交差する方向へ延びる遠位膨出部と、を備えている。
