We report a case of penile strangulation by a metal ring. An 81-year-old man visited our hospital with a complaint of penile swelling and urinary retention caused by a ring placed around the penile root to control the patient’s sexual desire ; the ring had been placed some days prior to presentation. We could not release the penile strangulation by hand or with a ring cutter in the emergency room. We decided to cut the thick metal ring in the operating room under local anesthesia and sedation with a surgical tool used in the orthopedic department. It took approximately 2 hours to cut the ring. The patient had made a satisfactory recovery 7 days postoperatively, and no complications were observed during the postoperative period.