A 66-year-old man visited our hospital because of vertigo and vomitting. Endoscopically, an elevated lesion with delle was revealed at the antrum of the stomach. Abdominal CT and MRI revealed a right renal hypoplasia and left renal tumor, subsequently, distal gastrectomy and partial resection for the left renal tumor was performed. The final histological diagnosis was small-cell carcinoma of the stomach with findings of INFα, medullary, sm, ly1, v1, n0, stage Ia and renal cell carcinoma papillary type, granular cell subtype. Forty months after operation, a left pulmonary nodule was detected and resected under thoracoscopic surgery. Histologically, the nodule was diagnosed as metastatic renal cell carcinoma and treated with interferon. Patients with gastric small-cell carcinoma are reported to have very poor prognosis, however, this patient in alive 5 years after the first operation, and is without renal failure.