To provide a stop watch for acquiring fair and highly accurate record data in order to prevent any unfair time difference between a leading competitor and a tailing competitor in a certain competition where there is a time difference in start time.

This competition recording system is configured to allow a few persons to focus on competition management by integrating a circuit to be operated by a laser beam for holding passwords and competition records into a digital stop watch, and easily exchanging record data between a non-contact device and equipment or the like with a personal computer as a center and the stop watch.