A lever-operated connector assembly according to one aspect of the present invention is constructed such that it comprises: a pair of connectors respectively accommodating therein female and male terminals and adapted to be fitted together, a lever member adapted to be turned for fitting and releasing the pair of connectors to and from each other, which lever member being provided to one of said pair of connectors and formed with a cam groove therein, a cam pin provided on the other one of the pair of connectors and adapted to be engaged in the cam groove, wherein the cam pin is situated such that a point of force action thereof is aligned with or is in the vicinity of the fitting axis of said pair of connectors. With the construction above, the fitting of the connectors can be smoothly carried out with no deviation, and further, the operability can be enhanced and the contact between the female and male terminals upon the connection can become sufficient, so that it is also made possible to enhance the reliability of the connector assembly as a product.