Clear cell sarcoma of kidney is highly malignant tumor that tends to occur in young infants, and has a tendency to metastasize to the bone. Our review of the literature disclosed 8 cases as to adults with clear cell sarcoma of kidney until December 1995. There was no report about it in the Republic of Korea. We report two adult patients, a young man and a young woman, who had a clear cell sarcoma of kidney. Key word : Clear cell sarcoma, Kidney, Adult