A 55-year-old man was hospitalized for pneumonia. His fever did not subside despite administration of antibiotics ; therefore, he was referred to our hospital. A chest radiograph and thoracic computed tomography showed multiple tubercles ; abdominal computed tomography (CT) showed left renal abscess. The patient's temperature fell after antibiotic administration, but inflammation reaction exacerbated. Abdominal CT showed inflammation spreading to the subcutaneous tissues. We considered renal resection, but the patient could not be administered general anesthesia because of low breathing function caused by pneumonia. We attempted open drainage and wedge resection of the left renal under local anesthesia ; but we were not able to identify the infectious bacteria. Four days later, the patient had blood poisoning and died because of deterioration of breathing function. Actinomyces was detected in the lungs and the kidneys by pathological examination.