Anterior sacral meningocele is a rare congenital lesion. The authors report a case of anterior sacral meningocele in a 51-year-old male who complained of lower abdominal pain and small caliber stool. Myelogram and magnetic resonance imaging(MRI) revealed a meningocele on anterior part of the sacrum communicating to the spinal canal. Total laminectomy on S 3, 4 and a ligation of the spinal canal between normal dura and meningocele on S 2/3 level were carried out. The patient returned to home 2 weeks postoperatively with complete relief of symptoms.