A series of 180 patients treated with ileal conduit urinary diversion at Nara Medical University and its affiliated hospitals were reviewed. The patients ages at the time of operation ranged from 21 to 79 years old with an average of 60.9 years old and the average postoperative follow-up period was 44.2 months. Early complications occurred in 60 patients (33.3%) and 9 (5.0%) of them resulted in post-operative deaths. Late complications were noticed in 54 (31.6%) of the 171 patients. Frequent late complications included peristomal dermatitis (37.3%), ureteroileal stenosis (17.9%) and urolithiasis (11.9%), for the latter two of which endourological treatments seemed to be effective. To be emphasized is that more attentive care should be paid to the condition of the peristomal skin during follow-up.