From January 1962 through December 1986, 71 cases of biliary atresia were operated on. Nine of these patients underwent only an exploratory laparotomy. A hepatic portoenterostomy (Kasai's operation) was performed on 62 infants with biliary atresia. Of these 62 children, 18 survived more than 10 years. However, 4 of the 18 died shortly thereafter because of persistent or recurrent jaundice and hepatic failure. Fourteen patients, however, are still alive more than ten years after portoenterostomy, today the actual 10-year survival rate is thus 22.5%. Six of them have no severe complications and their serum total bilirubin is less than 1.0 mg/dl. However, 8 patients, whose serum total bilirubin is more than 1.0 mg/dl, demonstrated numerous clinical problems such as esophageal varices, hypersplenism and recurrent jaundice after cholangitis. One of the patients in the latter group eventually underwent a liver transplantation because of the recurrent jaundice and hepatic insufficiency. In the treatment of biliary atresia, a close and careful follow-up is therefore essential especially for patients whose serum total bilirubin is more than 1.0 mg/dl.