Primary cardiac tumor is rare and the most Intracardiac tumor is atrial myxoma which occurs about 75% in left atrium, Biatrial myxomas are very rare Intracardiac tumor which have reported first by Ripstein in 1953 and successful surgical removal by Beeler and Kaufmann in 1961. We have experienced a case of biatrial myxomas intraoperatively which had diagnosed as left atrlal myxoma preoperatively and removed those under moderate hypothermia and cardiopulmonary bypass at the first In Korea, The patient was discharged with .good results, So we want to report this case with the review of the literatures.[KTCS 1982;1:107-111]