A connector in which the pivoting of a lever to a correct position can be used to detect whether male and female housings are in a fully fitted state. When a lever 30 is pivoted to a correct position, a stopping protrusion 40 fits with a lever stopping member 14 of a female housing 10, thereby causing the female housing 10 and a male housing 20 to fit completely together. When the lever 30 reaches the final position, releasing members 42 of the lever 30 push down arms 59 of a detecting member 50 attached in a groove 13 of the female housing 10, thereby releasing stopping members 60 of the arms 59 from an engaged state against regulating members 18 which protrude from side faces of the groove 13. As a result, the detecting member 50 can be pushed in an anterior direction. This movement of the detecting member 50 allows one to detect that the two housings 10 and 20 have been correctly fitted together. Furthermore, if the detecting member 50 cannot be moved, it can be detected that the two housings 10 and 20 are in a half-fitted state.