Trichobezoars are gastric concretions that are composed of hair or fibers. They are more common in children and adolescents and are usually associated with a pica, emotional disturbance, or mental retardation. Trichobezoar is quite rare in Korea. In most cases, trichobezoars tend to form a cast of the stomach. However, in rare cases, portions of the trichobezoar may separate from the gastric mass, migrate distally, and obstruct the small bowel. We report a case of small bowel obstruction due to multiple trichobezoars in a 14 year-old-girl who had a habit of swallowing hairs until 12 years of age. The patient was treated successfully surgically. (Korean J Gastrointest Endosc 2005;31:423426)