Electrical connecting box for vehicle

An electrical connecting box is provided to meet plural kinds of vehicles. The electrical connecting box includes a common unit S with a built-in standard circuit common to plural kinds of vehicles and an exclusive unit T with a built-in exclusive circuit peculiar to one of the plural kinds of vehicles. The exclusive unit T includes a plurality of module plates 21 each having a plurality of wire connecting pieces 30, a unit housing 23 for retaining a stack of the module plates 21 and a plurality of connecting bars 40 penetrating the stack of module plates 21 to connect the wire connecting pieces 30 on the module plates with each other, establishing a desired circuit as a whole. The exclusive circuit corresponding to a desired kind of vehicle can be provided by selecting the arrangements of the wire connecting pieces 30 and the connecting bars 40 appropriately.