The authors analyzed ultrasonographically the total 22 cases of clonorchiasis verified by stool examination and skin test and operation at Busan National University Hospital and St. Benedict Hospital for about 21 months from January 1981 to September 1982. 1. Clinical materials were consisted of 18 males and 4 females who showed right upper quadrant pain in 20 cases (90.9%), being most common, and elevated phosphatase in 13 cases (59.1%), eosinophilia in 10 cases (45.5%), elevated SGOT in 10 cases (45.%), elevated total bilirubin in 9 cases (41.0%), complication of hepatoma in 2 cases (9.1%), and liver cirrhosis in 4 cases (18.2%). 2. On ultrasonogram, the gall bladder showed tense spherical shape of wall in 17 cases (77.3%), more than 10cm in the longest diameter in 4 cases (18.2%), more than 3mm in the wall thickness in 9 cases (41.0%), and low level echogenicity with liquid-liquid level in the dependant part in 16 cases (72.7%). 3. The main bile duct showed more than 4mm in diameter considered as normal or moderate dilatation in 17 cases (77.3%), 1-2mm in the wall thickness, being most common, in 10 cases (45.5%), more than 2mm in 6 cases (27.3%), and intraluminal low level echogenicity in 14 cases (63.6%). 4. The peripheral biliary duct showed short two parallel echogenic lines indicating irregular dilatation of peripheral biliary duct in 20 cases (90.9%), echogenicity in dilated duct in 13 cases (59.1%), and thickened wall and the strong echogenicity of wall in 16 cases (72.7%). 5. The gall stone was associated in 2 cases (9.1%), and the stone of biliary duct in 2 cases (9.1%).