Vehicle information management system

A vehicle information management system that eliminates the necessity of a large capacity storage and allows an abnormality and a malfunction to be specified easily is provided. An updating unit 235 does not store diagnostic data obtained at the time of an engine stall in a storage 24 if it is determined that the engine stalls because of a rider's operation to the vehicle and stores diagnostic data obtained at the time of the engine stall in the storage 24 if it is determined that the engine stall is not attributable to a rider's operation to the vehicle, based on detection results from an operation detector 233 and an engine state detector 232.