A 65-year-old female was referred to our hospital with a complaint of urinary retention and macrohematuria. Ultrasongraphy, computed tomography, magnetic resonance imaging and cystoscopy revealed a 2 x 2 cm broad-based nonpapillary bladder tumor localized in the anterior wall of the urinary bladder. The clinical diagnosis was an invasive bladder tumor and transurethral resection of bladder tumor carried out for pathological investigation. Finally, we diagnosed it as inflammatory pseudotumor of urinary bladder. No local recurrence was seen 12 months after surgery. Inflammatory pseudotumor of urinary bladder is a relatively rare condition, and this is the 52nd case reported in the Japanese literature.