A connector is provided which has an actuator able to rotate around a pressure-applying portion arranged below upper beams between an open orientation and a closed orientation, and a stopping portion. The actuator is able to move with the actuator in the closed orientation between a first position where the stopped portion of the actuator comes into contact with the stopping portion to prevent rotation of the actuator from the closed orientation to the open orientation, and a second position where the stopped portion of the actuator has moved away from the stopping portion to allow rotation of the actuator from the closed orientation to the open orientation.