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[Abstract] Pancreatic adenocarcinoma is a rare cause of gastrointestinal bleeding, and it is extremely rare that the initial symptom of pancreaticadenocarcinoma is hematochezia, melena, or hematemesis. Moreover, there have been a few reports of successful treatment by emergencypancreaticoduodenectomy to control bleeding in such cases. We report the case of a 55-year-old man with melena who was found to have pancreaticadenocarcinoma directly invading the duodenum by histopathological examination. In this case, preoperative diagnosis of pancreatic adenocarcinoma was difficult. The endoscopic hemostatic procedure failed and emergency pancreaticoduodenectomy was performed successfully to stop bleeding. His postoperative course was uneventful, but he died 8 months after the operation of recurrence of pancreatic adenocarcinoma. The clinical course of this unusual case is reviewed.