The insulinoma is a rare tumor, usually small, solitary and benign with no prediction for any part of the pancreas. It is amendable to surgical cure but approximately 10percent are malignant and the peak incidence is encountered between ages 40~60. Surgery has been established as the treatment of choice. The reason for electing to operate rather than treat symptomatically is prevention of complications, such as increasing obesity, or prolonged and irreversible episodes of hypoglycemic coma with resultant permanent central nervous damage. During the anesthesia for a patient with insulinoam, the important problems are to recognize and treat hypoglycemia. This is a case report of a patient with insulinoma who underwent surgical treatment. Two years age, under the diagnosis of insulinoma, she was underwent distal pancreatectomy with splenectomy. But 3 months ago, hypoglycemic attacks recurred during fasting periods surgical intervention was performed under the diagnosis of recurrent insulinoma. She was anesthetized with thalamonal-nitrous oxide-oxygen, pancuronium, and 10 percent dextrose solution was administered throughout the operation. We monitered the level of blood sugar intermittently by using a rapie sugar analyser(Glucometer, Ames, Japan). No hypoglycemic episode during anesthesia was observed. We report the case of our anesthetic experience withan insulinoma and review the anesthetic choice and the management of the patient.