Abstract: A ground connection structure is a structure for collectively connecting, to a body of a vehicle, a plurality of grounding wires which are connected to respective electrical components installed in the vehicle. The ground connection structure includes: a connection box to which the plurality of grounding wires are connected; a grounding terminal part connected to the vehicle in an electrically conducting state; and an electrically conducting connection part having one end connected to the connection box and the other end connected to the grounding terminal part, the electrically conducting connection part connecting the connection box and the grounding terminal part in an electrically conducting manner. The electrically conducting connection part is made of a low-inductance material having low inductance.

Abstract: An attachment structure 1 includes: a plurality of attaching legs 5, 6, 7 projected from an outer surface of a box main body 2 as the object and overlapped with a vehicle attaching portion 3 as the subject; a washer 8 fixed to the vehicle attaching portion 3 together with one attaching leg 7 by a bolt, while being overlapped with the one attaching leg 7 at a side away from the vehicle attaching portion 3; and a cover 9 attached to the one attaching leg 7, holding the washer 8 between the cover 9 and the one attaching leg 7. The cover 9 is provided with an exposing hole 9a for exposing a first hole portion 8a provided on the washer 8.

Abstract: Each of electronic control units is configured to control electronic components in a vehicle, and is provided with a plurality of first terminals classified into a plurality of groups each of which is associated with electronic components in one of sections in the vehicle. A board has a first face on which the electronic control units are mounted. First connectors are provided on a second face of the board. Each of the first connectors has second terminals each of which is electrically connected to one of the first terminals in one of the groups in each of the electronic control units, and is configured to be connected to a wire harness extended to one of the sections in the vehicle.

Abstract: Each of electronic control units is configured to control electronic components in a vehicle, and is provided with a plurality of first terminals classified into a plurality of groups each of which is associated with electronic components in one of sections in the vehicle. A board has a first face on which the electronic control units are mounted. First connectors are provided on a second face of the board. Each of the first connectors has second terminals each of which is electrically connected to one of the first terminals in one of the groups in each of the electronic control units, and is configured to be connected to a wire harness extended to one of the sections in the vehicle.