Blowout fractures of the orbit is painful and bothersome accidental disease to both patients and doctors. The follow-up study of the cases was reported with some discussion. Fifty-two cases of blowout fractures of the orbit were treated in the otorhinolaryngological department of Yamaguchi University Hospital from 1981 to 1990. There were 42 males and 10 females treated. The age of the patients ranged from 5 to 78 years, and the mean age was 22.8 years. The most common cause of this type of fractures was sports related, and the second common cause was violence. Twenty-two patients were operated on, and thirty patients were treated by means other than surgery. The time lapse between the injury and the operation varied from 1 to 125 days, and averaged 31.9 days. Seventeen out of 22 patients were operated on within 1 month after injuries and 14 of 22 patients were ultimately fre from diplopia in daily life by not only surgical treatments but also steroid treatment and eye ball exercises. It was concluded that we need pre-operative and post-operative eye ball exercises in adition to operation and steroid treatment in order to manage patients with blowout fractures.