We report a case of adenocarcinoma of the augmented bladder 19 years after ileocystolasty. The patient was a 53-year-old man who underwent right nephrectomy and ileocystoplasty (Pyrah's method) for contracted bladder due to tuberculosis in 1965. In another hospital, transurethral resection (TUR) was performed against a tumor in the anastomotic site between the bladder and the ileal segment in 1996. Histopathological examination of the specimen obtained by TUR revealed poorly-differentiated mucinous adenocarcinoma. In our hospital, partial cystectomy with total resection of ileal segment and ileocystoplasty were performed. The tumors located in the anastomotic site between the bladder and ileal segment as well as in the ileal segment. Histopathological examination revealed poorly-differentiated mucinous adenocarcinoma. The patient has survived 12 months without any evidence of tumor recurrence. To our knowledge, this is the eighth case report in Japan.