The metastasis of breast cancer to the gastrointestinal tract is very rare. This paper describes a case of gastrectomy for a gastric metastasis from breast cancer diagnosed by gastric tissue at biopsy and past history. A 52-year-old woman developed epigastralgia and vomiting 3 years and 4 months after a modified radical mastectomy for a left breast cancer (t 3 n 1 m 0 stage III) . Radiological and endoscopic examination of the stomach showed a linitis plastica lesion. A specimen obtained from the lesion revealed metastasis from the breast cancer. Total gastrectomy was done to improve QOL. Diagnosis of the gastric metastasis from the breast cancer is difficult because the histological lesion is likely to be the primary gastric cancer. When a patient with a previous history of breast cancer has gastrointestinal symptoms, we should consider the possibility of gastrointestinal metastasis from breast cance and rule out primary gastric cancer.