We report a case of double cancer, advanced gastric cancer and intraductal papillary adenocarcinoma of the pancreas in a patient presented with hematemesis. A 61-year-old man was admitted to the hospital because of hematemesis. He was diagnosed as having a Borrmann 2 type gastric cancer and achieved temporary hemostasis by an emergency endoscopy. Computed tomography showed multilocular cytic lesion on the pancreas head and dilatation of the main pancreatic duct. Intraductal papillary adenocarcinoma of the pancreas was highly suspective by a cytology of pancreatic juice. Total gas-trectomy and a pancreaticoduodenectomy with regional lympohnode dissection were carried out. Postoperative course was uneventful, and he was discharged from the hospital on the 45th postoperative day. Double cancer of the pancreatic cancer with other organ cancer is relatively rare, especially that of intraductal papillary adenocarcinoma. this case was the second report in the Japanese literature to our knowledge.