VEHICLE-MOUNTED ASSEMBLY

A vehicle-mounted assembly is designed to have a vehicle-mounted device attached to a plate-like vehicle body member with a through hole. The vehicle-mounted device includes a cylindrical member fit in a through-hole and a fastener which secures the cylindrical member to the vehicle body member. The cylindrical member includes a cylindrical main body extending along a center axis line, protrusions protruding from the main body in a direction crossing the center axis line. The fastener is held between the protrusions and the vehicle body member. The through-hole is equipped with a vehicle body joint which engages a device joint made of recessed and raised portions of the cylindrical member. The vehicle body joint is arranged at a given location on an inner circumference of the through-hole around a center of the through-hole.