We report a case of small bowel perforation secondary to metastasis from a lung squamous cell carcinoma that occurred in a 72-year-old man. He was admitted to the hospital because of remittant hemoptysis after undergoing a right upper lobectomy. Fiberoptic bronchoscopy revealed bleeding from the right upper lobe bronchial stump that was due to recurrence of the tumor. He developed abdominal pain, nausea and vomiting four months after resection of the primary tumor. An abdominal radiograph demonstrated free air in the abdominal cavity. He was diagnosed as having intestinal perforation and was operated on. The operative findings indicated adherence and perforation of the jejunum and ileum. The pathological diagnosis of the removed tumor was poorly differentiated squamous cell carcinoma. The patient died 32 days after the second operation. Although abdominal metastasis from lung cancer is not an unusual postmortem finding, it is rare in clinical situations. If a patient with lung cancer complains of abdominal pain, it is important to consider the possibility of abdominal metastasis.