Abstract: The present invention is to provide a cantilever structure connector without an extended portion of a main locking arm and provide also a locking feeling similar to that of a center impeller structure connector. When a male and female housings are connected to each other, rib protrusions disposed at inner walls of ribs abut to side protrusions and parts of side locking arms enter into between the main locking arms and the male housing. Accordingly, the main locking arms become temporarily a center impeller structure. When a center protrusion abuts to main protrusions, the main protrusions are subjected to a large downward force, or a large upward repulsive force.