Three cases of urachal carcinoma are presented. Chief complaints were passage of mucous urine in a 58-year-old man (case 1), hematuria and frequency in a 63-year-old woman (case 2) and hematuria in a 45-year-old man (case 3). Urine cytology were negative for all cases and serum CEA level was elevated in case 1. Mass in the area of the bladder dome were revealed by cystoscopic examination in all cases. CT scanning, TUR biopsy and cystogram were valuable diagnostic procedure. En bloc segmental resection were performed on all cases, and case 1 and case 2 have been well without disease for 36 and 40 months, respectively. Case 3 died 65 months after operation with disseminated carcinoma. Histologically mucin-producing adenocarcinoma were found in all cases. Statistic examination and discussion are made of 237 cases of urachal carcinoma reported in Japan.