The coracoclavicular joint is a rare genetical anatomic variants. The joint occurs at the junction of a bony projection extending inferiorly from the outer third of the clavicle at the site of the conoid tubercle and a bony projection extending superiorly from the coracoid process of the scapula. In our study we reviewed the radiological incidence of the coracoclavicular joint in Korean dadults. The materials consist of 4,625 routine chest films, 9,250 sides. Sex distribution were 3,000 males and 1,625 females. The authors observed coracoclavicular joint on 17 persons (0.37%) and 25 sides (0.26%) and among them, 8 persons (47%) were bilateral and in 9 (53%) it was unilateral. The joint when unilateral occurs frequently on left side, and there was no significant sex difference. There were statistically significant differences in the incidence of coracoclavicular joints among Korean, Japanese and Chinese.