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We report a patient who developed urinary retention due to the presence of necrotic tissues in the bladder 5 months after kidney transplantation. The patient was a 47-year-old female who had been diagnosed with immunoglobulin A nephropathy. She requested to receive a living-donor kidney transplant from her husband, and was referred to our hospital. Given that the patient had anuria preoperatively, her bladder capacity was presumed to have decreased following the transplantation. There were no events regarding vascular anastomosis during the surgery. However, since ureteroneocystostomy was difficult to perform due to the thinning of the bladder wall, the recipient's own ureter was anastomosed to the ureter of the transplanted kidney. Since the patient had difficulty voiding soon after the indwelling urinary catheter was removed, clean intermittent self-catheterization was initiated. Abdominal computed tomography revealed perforation of the bladder and extravesical urinary leakage on postoperative day 15. An indwelling urinary catheter was reinserted as conservative treatment. We removed the indwelling urinary catheter on postoperative day 25. The patient was discharged on postoperative day 30. Five months after transplantation, the patient suddenly developed urinary retention. Cystoscopy revealed some tissue hanging from the anterior wall of the bladder. The tissue was removed, and her voiding function improved. On pathology, the tissue was found to be non-specific necrotic tissue. This finding suggested that the necrotic tissue had caused urinary retention 5 months after transplantation. The symptoms of urinary retention markedly improved after the treatment.