A case of bilateral synchronous renal cell carcinoma is reported. The patient was a 55-year-old man. A right renal tumor was pointed out by ultrasound during a health check in July, 1994. Enhanced CT scan and angiography revealed bilateral renal tumors. Right nephrectomy and left partial nephrectomy were performed on November 25, 1994. Both tumors were completely encapsulated. Histological examinations of these tumors revealed renal cell carcinoma, Expansive type, alveolar type, clear cell subtype, G2, INF alpha, pT1, pV0.