Primary carcinoid tumor of duodenum are rare, Usually, small duodenal carcinoid tumors are often discovered endoscopically. Most of these tumors are asymptomatic, but in rare cases, jaundice, hemorrhage, duodenal obstruction, or carcinoid syndrome were apparent. Uaually, the recommended treatment is surgical or endoscopic excision of the tumor. We experienced a case of carcinoid tumor of duodenu in 53 year-old women. A 53-year-old female patient was admitted to our hospital because of epigastric discomfort and indigestion. On the gastrofiberscopic examination, 0.9 cm sized polypoid mass with central umblication was noted on the duodenall bulb. The biopsy specimen showed carcinoid cells. She was treated with endoscopic polypectomy. (Korean J Gastrointest Endosc 18: 584-588, 1998)