We describe the case of a 56-year-old man who had been shot by a pneumatic nail gun in the chest during work. He had removed the nail by himself immediately at the accident field. He visited to the emergency department of a local hospital and, after a simple dressing and simple history had been taken, he was referred to our emergency department for penetrating thoracic injury. Immediately, Transthoracic echocardiography were done and showed moderate hemopericardium. Patient had been hydrated and transported to the operating room. After cardiac wound repaired by midsternotomy, the patient was discharged on the 13th postoperative day without complications except mild mitral valve regurgitation.