A 59-year-old man was admitted to the hospital because of a tumor shadow in the right lower lung field on a chest X-ray film in September 2000. The patient had been followed after a wide excision with chemotherapy for malignant fibrous histiocytoma (MFH) in the left leg in January 1995. He was entirely asymptomatic and further examinations could not detect any other lesions or metastasis. The tumor was considered to be metastasis of MFH because of his past medical history, and an operation was performed via a muscle-sparing thoractomy in October 2000. The tumor was situated between the right middle lobe and right lower lobe growing prominently from the lung. The tumor was removed with partial resections of the adjacent parts of the right middle lobe and right lower lobe. The tumor was 7.3×5.9cm in diameter and the cut surface was solid and whitish with a central calcification. Histopathologically the diagnosis was made as grade 3, conventional type chondrosarcoma. Primary chondrosarcoma of the lung is a rare disease and only 12 cases of this disease have been hitherto reported in Japan including the present case.