To provide an electric wiring connector in which operation of stopper releasing is not required at connection and completion of connection can be confirmed visually.

In the connector, a stopper guide 212, of which width in the axis direction widens toward the screwing direction of a coupling 3 and becomes zero at the coupling position, is provided at the casing 21 of a plug 2 to be engaged with the coupling 3, and a stopper 331 which moves in the axis direction by contacting this stopper guide 212 and a spring energizing in the direction of returning this are provided at the cylinder of the coupling 3.