A case of a peroneal nerve palsy caused by repeatedly recurred intraneural ganglion cyst is presented. A 19 year old male suffered from tingling sensation on the foot dorsum more than one year and underwent two times of mass excision and nerve palsy was recorvered. But it was recurred once more after 10 months after the second excision. The mass was located in the fibro-osseous tunnel against the fibular neck and the origin of the peroneus longus. The third complete excision was done and full recovery was obtained in 6 months.