Small bowel diseases are uncommon and difficult to be diagnosed by conventional methods such as endoscopy and radiologic study. Recently, wireless capsule endoscopy has been known as a new diagnostic method to detect the small bowel diseases, especially in patients with obscure gastrointestinal bleeding. A 48-year-old male patient admitted our hospital with signs of gastrointestinal bleeding and iron deficiency anemia. There was no evidence of bleeding in upper and lower endoscopic exams. Finally, wireless capsule endoscopy demonstrated small bowel polyp as a cause of obscure gastrointestinal bleeding. We report a case of small bowel polyp bleeding diagnosed by wireless capsule endoscopy with a review of relevant literatures. (Korean J Gastrointest Endosc 2004;29:204208)