Rear vehicle structure for housing one or more electrical system unit(s) in the rear of a vehicle, in which side members are provided proximate to a rear suspension of the vehicle, at least one side member on either side of the vehicle. Extension parts extend rearwardly from respective rearward ends of the side members, a forward cross member is located substantially at a forward end of the side members and above the rear suspension members, and a rearward cross member is located substantially at a rearward end of the side members and above the rear suspension members. The electrical system unit is fixedly attached to the top of at least one of the forward cross member or the rearward cross member.