Abstract: A connector with a locking mechanism which includes a plug body, a cylindrical member secured to an outer periphery of the plug body, a slidable cover provided for forward and rearward movement on an outer periphery of the cylindrical member, a locking member provided for forward and rearward movement between the slidable cover and the cylindrical member, and a spring provided between the locking member and the cylindrical member for forwardly biasing said locking member. The locking member is provided with an interlocking portion interlocked to the slidable cover such that it is moved rearwardly against the spring force of the spring with a rearward movement of the slidable cover. A socket is provided which has contacts electrically connected to the contacts of the plug body.