A method in which a buccal epithelial cell suspension is prepared, and the buccal epithelial cell suspension is cystoscopically transplanted into a defect site in an adult urethra. [Selection diagram] Fig. 1頬上皮細胞懸濁液を調製し、成人の尿道の欠損部位に頬上皮細胞懸濁液を膀胱鏡的に移植する方法。【選択図】図1