Frimary small cell careinoma of the stomach is an extremely rare disease. It has similar clinical behavior with small cell cardnoma of lung, which shows aggressive course with rapid and wide dissemination and very poor prognosis. We report a case of concurrent occurrence of primary small cell carcinoma and adeno- carcinoma in the stomach with multiple intraaMominal metastases, which had responded to combination chemotherapy with 5-FU, VP-16, and Cisplatin.