RELAY DEVICE

A relay device to be installed in a vehicle, including: an external wireless communication unit that is configured to perform wireless communication with a communication device that is provided outside of the vehicle; a wired communication unit that is configured to perform wired communication with an ECU for controlling an in-vehicle device that is installed in the vehicle; an in-vehicle wireless communication unit that is configured to perform wireless communication with the ECU; and a communication control unit that is configured to identify information transmitted from the communication device and control communication performed by the wired communication unit or the in-vehicle wireless communication unit in accordance with a result of the identification.