We report 3 cases of leiomyoma of the urinary bladder. One patient was a 57-year-old female. Magnetic resonance imaging (MRI) revealed a small tumor, and cystoscopy revealed a submucosal tumor on the left wall. Partial cystectomy was performed, and she has had no recurrence for 10 months. Two females who were aged 68 years and 52 years, were referred to our hospital with the complaint of pain of meatus of urethra, and pollakisuria, respectively. Transurethral resection of bladder tumor (TURBT) was performed, and they have had no recurrence for more than 3 and 4 years, respectively. Histological examination in the three cases showed a leiomyoma of the urinary bladder. To our knowledge, there are 151 cases of leiomyoma of the urinary bladder reported in the literature in Japan.