A mounting structure for installing an electrical appliance module for mounting on the vehicle on board equipment of the instrument panelboard of the automobile wherein the connection of the connector of the wire harness of the body side is performed reliably and smoothly. There are provided a connector accommodating section B for the instrument panel P as the vehicle on board equipment, and a module mounting section 13 for the receptive connector C. The module mounting section 13 allows the receptive connector C to mount on the connector accommodating section B, and it allows the introducing projection 14 of the receptive connector C to insert into the fitting groove 3 provided at the electrical appliance module A. The electrical appliance module A can thus be assembled to the instrument panel, and the terminal of the electrical terminal receptive connector C of the electrical appliance module A is connected to the instrument panel.