The author studied total 69 cases of biliary ascariasis, who had been admitted B. B. U. Hospital. St. Benedict, Busan Gosphel, and Baptist Hospital from January 1973 to January 1977. The results were summarized as follows: 1. The sex distribution of total cases was 57 cases (82.7%) in female and 12 cases (17.4%) in male, ie., the sex ratio 1 : 4.7 (M:F). The predominant age incidence was 3rd and 4th decades as 37 cases (53.7%). 2. Important clinical symptoms and signs were severe epigastric pain which tend to other part of the body, nausea, vomiting, RUQ epigastric tenderness. and jaundice, but symptoms and signs were not differentiated that occurs in cholelithiasis and cholecystitis. 3. The liver function tests appeared to be slightly abnormal, due to the obstruction of the biliary tracts, such as increased total serum bilirubin and elavated Alkaline phosphatase. 4. Stool examination was done in all of the cases by direct smear method. Ascaris ova was positive in 54 cases (74 ). 5. Preoperative clinical diagnosis of 69 cases was suspected as 26 cases (38) of choledochoascariasis, 11 cases were confirmed by I. V C. 6. I. V. cholangiograms showed cord-like filling defect within the common bile duct in 11 cases (44%) out of 25 patients performed, and additional findings were dilated common bile duct over 11mm and loss of normal tapering of distal portion of CBD. 7. Postoperative findings revealed as 23 cases (33%) of choledochoascariasis without other disease, 23 cases (33%) combined with cholelithiasis, 18 cases (26%) with cholecystitis and cholangitis, and 4 cases (5.8%) with empyema of gall-bladder.