An operable case of pedunculated localized mesothelioma of the pleura, a 62-year-old male, came to our clinic with chief complaint of chest X-ray abnormal shadow. On suspicion of pleural tumor, resection was performed. The operative findings revealed that the tumor was arising from visceral pleura of S1 + 2 a segment of left upper lobe, and didn't invade into peripheral tissue. The microscopic findings revealed that the tumor was consist of spindle tumor cells and capillary-like lesions, and had high cellularity and many mitosis. The tumor was diagnosed as localized malignant mesothelioma. Immunohistochemical stainings were performed using six monoclonal antibodies, vimentin, CEA, EMA, keratin (AE1, AE3), Leu-M1. Only vimentin reacted with tumor cells.