An automatic connector mutually-fitting mechanism in which a pair of connectors (used mainly in electric wiring in an automobile), mounted respectively on separate structural members, are fitted together. In the automatic connector mutually-fitting mechanism, one connector is projectably and retractably mounted on one structural member, and the other connector is fixedly mounted on the other structural member, and a fitting lever, having a first cam groove and a second cam groove, is movably mounted on the other structural member while a drive projection, formed on the one structural member, is engaged in the first cam groove, and a driven pin is engaged in the second cam groove, and the two structural members are connected together, and are disengaged from each other, so that the two connectors are fitted together, and are disengaged from each other through the movement of the fitting lever.