A gastrointestinal stromal tumor (GIST) is a rare disease but is the most common nonepithelial neoplasm in the gastrointestinal tract. GIST accounts for 0.1∼3.0% of gastrointestinal malignancies, and 20∼30% of GISTs are found in the small intestine. GIST with extraluminal growth is difficult to diagnose. We report a case of a jejunal GIST with obscure bleeding that was diagnosed using double balloon enteroscopy. (Korean J Gastrointest Endosc 2006;33:163167)