We report a case of morbid obesity accompanied by obstructive sleep apnea syndrome (SAS) and obesity hypoventilation syndrome (OHS). Satisfactory weight control was obtained without significant surgical complications after vertical banded gastroplasty. With the reduction in weight, the symptoms of SAS and OHS, as well as several other complications caused by the severe obesity, disappeared. Quality of life also improved remarkably, as exhibited by improved activity performance and disappearance of irritability at waking. Thus, it appears that vertical banded gastroplasty is efficacious in the treatment of morbid obesity with sleep apnea and hypoventilation.