A 75-year-old male patient developed hematemesis due to gastric cancer 1 week before scheduled aortic valve replacement for severe aortic stenosis. A gastrectomy was urgently required, but the risk of intraoperative cardiac decompensation was judged as too high because of the severity of his cardiac disease. On the other hand, cardiopulmonary bypass posed an exceedingly high risk of bleeding from the stomach cancer. Concomitant aortic valve replacement and gastrectomy were performed successfully.