PROBLEM TO BE SOLVED: To provide a connector device in which a fitting state can easily be confirmed by using only components (members) required for a normal connector.SOLUTION: A first housing of a first connector has a fitting recess in which a plurality of first terminals are arranged on the fitting side to a second connector. A second housing of the second connector capable of fitting to the first connector includes a fitting projection in which a plurality of second terminals are arranged on the fitting side to the first connector. When the first connector and the second connector are fitted to each other, the fitting projection is fitted to the fitting recess, and the first terminals and the second terminals are correspondingly connected. On the outer surface of the fitting projection, a plurality of window portions that expose at least a part of the second terminals are provided, and these window portions are configured so that they cannot be seen from the outside when the fitting projection is fitted
