Adenosquamous cell carcinoma of thje stomach is uncommon, pasticularly that occurring in the residual stomach at the site of the gastrojejunostomy. This paper dealed with a case of adenosquamous cell carcinoma at the site of gastrojejunostomy 31 years after gastrectomy. A 57-year-old man who had had distal gastrectomy and gastrojejunostomy (Billoroth II) for benign duodenal ulcer was admitted to our hospital complaining of epigastric pain. Carcinoma at the site of gastrojejunostomy was found as a result of various examinations, and total resection of the residual stomach and combined resection of the pancreas and the transverse colon were performed. The infiltrative and ulcerative tumor at the site of gastrojejunostomy was 5.5×4.0cm in size. Histology revealed adenosquamous cell carcinoma. Six months after surgery the patient died of peritonitis carcinomatosa and the liver metastasis of the carcinoma.