The cause of recurrent acute pancreatitis can be identified in the majority of patients. A small group of patients in whom an etiological association is not obvious is characterized as idiopathic recurrent pancreatitis. Recently dysfunction of Sphincter of Oddi is also suggested as the possible cause of idiopathic recurrent pancreatitis. We could diagnose a patient as dysfunction of sphincter of Oddi, who had manifested recurrent acute pancreatitis, by ERCP and sphincter of Oddi (SO) manometry. Manometric finding showed tachyoddia and the patient received eodoscopic sphincterotomy for treatment.