ONBOARD RELAY APPARATUS

An onboard relay apparatus, connected to a plurality of onboard devices and relays communication to the onboard devices, is provided on a roof and includes a branch line connector connected to an onboard load; a main line connector connected to a power supply apparatus supplies power and a second onboard relay apparatus, which are included in the plurality of onboard loads, provided in an area other than the roof via a power line and a communication line provided on a pillar of the vehicle; and a control unit configured to control power supplied from the power supply apparatus via a power line provided on the pillar and distributed to the onboard load via one of a plurality of power lines provided on the roof and controls relaying communication to the onboard load and the second onboard relay apparatus.