We reported a case of left atrial myxoma in advanced age. The case was eighty years old man. He admitted with congestive heart failure. He was diagnosed as left atrial myxoma by echocardiography. The open heart surgery was done. The myxoma was 79 g in weight and 8.5x5x3 cm in size. Post operative course was uneventful. The echocardiography is useful for diagnosis of the left atrial myxoma. The left atrial myxoma should be operated when it is diagnosed how the patient is advanced age. The septal-superior exposure gives a good operative field.