In a connector assembly for receiving a plurality of mating connectors each provided with a wire harness, each of subassemblies is provided with a first internal space and a second internal space which are defined by an internal partition wall, and conductive tabs piercing the partition wall so as to project into both of the first internal space and the second internal space. The subassemblies are stacked one on another. Each of the connectors is inserted into the first internal space of an associated one of the subassemblies. Terminals are provided in each of the connectors to be electrically connected to the conductive tabs. A first end of an electric wire is connected to one of the terminals which is provided in one of the connectors. A second end of the electric wire is connected to another one of the terminals which is provided in another one of the connectors. Each of the mating connector is inserted into the second internal space of an associated one of the subassemblies, to be electrically connected to the conductive tabs.