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We experienced a rare case of ureteropelvic junction disruption (UPJD) as a seat belt injury. A 19-year-old female was transferred after a car accident while wearing a seat belt. Computed tomography showed multiple fractures including Chance fracture dislocation of the first lumbar spine and right renal laceration with partial infarction. Emergency posterior spinal fusion was performed. The next day, computed tomography revealed right perirenal contrast extravasation, and right UPJD was confirmed with retrograde urography and ureteroscopy. Ureteropelvic reanastomosis was performed. Computed tomography of excretory phase or repeat evaluation is recommended to prevent delayed diagnosis of UPJD including seat belt injury.