The patient was a seventy-seven-year old woman, who was diagnosed with advanced gastric cancer with stenosis of the esophagocardiac junction. Her cancer was diagnosed as Stage IV (T3N3H0P3M0). As there was no indication for surgery, radiation therapy (Linac electron beam, 1.8 Gy/day, total 50.4 Gy) was selected to improve the stenosis, after which she was able to eat food. Subjective complaints such as nausea and vomiting were also decreased, promoting her QOL. We conclude that radiation therapy treatment can be a treatment option for far advanced cardiac cancer.