Ulcerative colitis(UC)is a chronic inflammatorydisease. Since it is known to be a risk factor for colorectal cancer, severe cases, refractorycases, or cases with cancer are often treated with surgery. We report a case of anal canal squamous cell carcinoma(SCC)found 9 years after subtotal colectomy for UC. A 32-year-old man underwent subtotal colectomyand ileorectum anastomosis 9 years ago for fulminant UC. Anemia was detected during treatment with infliximab, which was initiated 2 years ago. Endoscopic findings revealed a type 3 tumor at the anal canal in the anastomotic region, and he presented to our department. Further examination confirmed the diagnosis of anal SCC. Multimodalitytherapywas performed; however, the patient died 9 months after the first presentation to our hospital. UC has a high incidence of juvenile onset and is associated with increased risk for developing cancer; therefore, considering this case, we want to emphasize on the importance of long- term surveillance.