A 71-year-old man was admitted to our hospital because of abnormal shadow on the chest X-ray. CT scan showed two tumor masses in the anterior superior mediastinum. The operation was performed through median sternotomy. Two masses, 2.5 x 2.5 x 2.0 cm and 1. x 3.0 x 2.5 cm in size, were found to arise from the right lobe of the thymus. Total thymectomy including resection of the right pleura was performed, and mediastinal lymph nodes were dissected. The pathological diagnosis was thymic carcinoid with metastasis to the anterior mediastinal lymph node. The patient underwent postoperative radiation therapy of total dosage of 50 Gy, and had no evidence of recurrence one year after operation.