IN-VEHICLE RELAY APPARATUS

An in-vehicle relay apparatus provided on a roof of a vehicle includes: a first connector connected to a power line and a communication line provided on one pillar of the vehicle; a second connector to which a power line and a communication line provided on a different pillar are connected; a branch line connector to which power lines and communication lines extending from a plurality of in-vehicle devices provided on the roof are connected; a branching portion branching a single wire system into power lines connected to the branch line connector, the single wire system being a system in which the power lines respectively connected to the first connector and the second connector are integrated into one system; and a relay unit relaying data passing between the communication lines connected to the first connector and the second connector and the communication lines connected to the branch line connector.