A vehicle information management system eliminates the need for a large capacity storage and allows an abnormality and a malfunction to be easily specified. An updating unit does not store diagnostic data obtained at the time of an engine stall in a storage if it is determined that the engine stalls is because of a rider's operation of the vehicle, and stores diagnostic data obtained at the time of the engine stall in the storage if it is determined that the engine stall is not attributable to a rider's operation of the vehicle, based on detection results from an operation detector and an engine state detector.