To provide a connecting code in which not only the presence of a connector can be regularly clarified with sureness, and a light emitting function can be effectively exhibited over a long period by making at least the connector constituting the connecting code emit light by current-carrying.

An outer shell part 4 of at least a connector 2 constituting a code body 1 is formed in such a manner as to be transmittable, and a light emitting body 8 is connected to contact terminals 6 of both electrodes provided in the outer shell part 4 in such a manner as to be capable of emitting light by current-carrying. The light emitting body 8 is fixed and supported between the contact terminals 6 of both electrodes through an insulating support member 9.