Meckel's diverticulum is an embryonic derivative of the omphalomesenteric duct and the most commonly encountered congenital anomaly of the gastrointestinal tract. Its incidence records about 2%. Among them, only 5% are symptomatic with complications-bleeding, intestinal obstruction, inflammation, and perforation. In particular, bleeding is a common complication and has always been caused by an ulceration of the ileal mucosa adjacent to the acid-producing ectopic mucosa in a Meckel's diverticulum. Wireless capsule endoscopy is a new method enabling non-invasive diagnostic endoscopy of the entire small intestine. We experienced a case of Meckel's diverticulum detected by wireless capsule endoscopy in a 34 year-old man who presented with chronic obscure gastrointestinal bleeding.