This is a report of 12 cases of esophageal diverticulum treated surgically at the Department of Thoracic and Cardiovascular Surgery, Hanyang University Hospital during the 16 years. 10 patients were female and 2 were male and the age distribution was between 31 and 61 years. Various subjective symptoms were noticed preoperatively. Diagnosis was confirmed by esophagography. The type of esophageal diverticulum were pulsion type in 11 cases and traction type in one case, and they were all located on the mid-thoracic esophagus, but one case was associated with epiphrenic pulsion diverticulum After diverticulectomy with or without myotomy, subjective symptoms disappeared and there were no operative complications and mortality. Indication of myotomy evaluated with motilities status by fluoroscopic finding of X-ray barium study. Recurrence of symptoms was not noticed during follow-up.