A connector housing apparatus includes a main body section that has a plurality of connectors confronting a plurality of external connectors of an external housing and a moving guide section that guides movement of the main body section toward the external housing. The moving guide section has a latching section that latches the moving guide section on the external housing. The main body section is connected to the moving guide section so as to be movable in a fitting direction of the plurality of connectors. The latching section latches the moving guide section on a position at which the plurality of connectors are fitted to the plurality of external connectors. The main body section moves along the moving guide section in the fitting direction of the plurality of connectors, and thereby the plurality of connectors are fitted to the plurality of external connectors.