The patient was a 66-year-old man who visited the hospital with hemoptysis and left anterior chest pain. Chest CT revealed a mass shadow with uneven internal absorption between the upper and lower lobes of the left lung. The left bronchial artery was identified as the feeding vessel of suspected left interlobar hematoma and was embolized, but bloody pleural effusion and progression of left lower lobe atelectasis increased; therefore, medical treatment was determined to be difficult and thoracoscopic hematoma removal was conducted. Solid lesions suggestive of a tumor were unclear, and a large volume of blood clots was observed between the lobes. A portion of the hematoma was submitted for pathological examination, and sarcomatoid carcinoma was diagnosed. There have not been any reports of lung cancer presenting with interlobar hematoma without clear lesions suspected of being a solid tumor. Thus, we report the present case.