We report aprimary malignant pericardial mesothelioma. Thirty-eight-year-old male patient complained of dyspnea and chest pain with left shoulder pain. At first, we thought it was because of tuberculous constrictive pericarditis and performed medical management for one and a half years. But, the above symptom recurred repeatedly; therefore we did pericardiectomy and diagnosed his case as malignant pericardial mesothelioma. Tumor was sticked to the myocardium and complete resection was impossible. He received postoperative chemoradiotherapy.