Carcinoma of the stomach in childhood is exceedingly rare. We now report on a case of carcinoma of the stomach in a 7-year-old Japanese boy, the youngest with so-called adult-type carcinoma of the stomach in Japan. The tumour was located mainly in the cardial region. Total gastrectomy was performed and an oesophago-jejunostomy was constructed. Histological studies revealed an anaplastic adeno-carcinoma. The possibility of gastric malignancy should always be considered when gastro-intestinal symptoms persist, even in children.