An 85-year-old man received ileocecal resection and cholecystectomy for ascending colon cancer with synclonus liver metastases. After a catheter for intraarterial injection into liver was inserted and it fixed to the gastroduodenal artery, an intraarterial chemotherapy of 5-FU 750 mg/body/5 hr biweekly was performed for liver metastases. He had no system trouble and side effects, and liver metastases had been estimated as stable disease for 23 months. After progression of the disease, other chemotherapies such as intraarterial injection of CPT-11 or oral intake of S-1 were not tolerated due to side effects and were immediately discontinued. He died after 31 months postoperatively. Chemotherapy for elderly patients is a key issue in Japan, which is renowned worldwide for its longevity. Nowadays, the standard chemotherapy for unresectable liver metastases from colorectal cancer is continuous venous injection therapy such as FOLFOX. Although intraarterial injection chemotherapy has a risk of system trouble, this procedure could be acceptable for elderly patients because of less anti-cancer drug toxicity. Thus, it should be considered one of several treatment options for unresectable liver metastases in elderly patients.