A 71-year-old woman visited her nearby hospital because jaundice and right hypochondralgia. She was diagnosed as obstructive jaundice due to duodenal papillary carcinoma and was introduced to our hospital. Chest computed tomography showed some tumors in both lung and left breast, then the breast tumor was diagnosed as primary breast cancer by needle biopsy. Since it was difficult to distinguish whether multiple tumor of lung was primary lung cancer or metastasis, right pulmonary partial resection using a thoracoscope was performed. In histopathological examination, it was diagnosed as adenocarcinoma of the pulmonary primary. Multiple bone metastases were also showed by bone scintigraphy. Therefore, the diagnosis was advanced progressive synchronous triple cancer with bone metastasis. She did not hope for aggressive treatment, it has now reached observation of no treatment. In recent years, due to advances in diagnostic technology reports of duplicated cancer cases are increasing, but I have experienced a case of extremely rare triple cancer of the breast, duodenal and lung.