Vehicle-mounted component

A vehicle-mounted component includes a box main body and a cover member covering an opening portion of the box main body and is configured to be fixed to a through hole provided in a vehicle body panel,

• wherein a first side surface of a peripheral wall of the box main body is arranged opposite to the through hole, and includes a covering lid wall portion that protrudes more in a height direction of the peripheral wall than other side surfaces of the peripheral wall of the box main body and extends in a manner covering the through hole,
• a hook recessed portion that is inserted into a first peripheral edge portion of the through hole and a lock fitting portion that is fitted to and locked to a second peripheral edge portion opposite to the first peripheral edge portion of the through hole via an elastic deflection piece are provided on a surface of the covering lid wall portion on the through hole side, and the covering lid wall portion is fixed to the vehicle body panel via the hook recessed portion and the lock fitting portion of the covering lid wall portion, and
• a guide portion into which a fitting portion provided on an outer surface of the cover member is fitted is provided on a surface of the covering lid wall portion on the box main body side so as to be located on a protruding end portion side with respect to the box main body, and a lock portion provided in an opening end portion of the cover member is positioned with respect to a locked portion provided on the other side surface of the peripheral wall of the box main body by fitting the fitting portion of the cover member into the guide portion of the covering lid wall portion.