A mooring device for mooring a water craft to a mooring berth. The mooring device includes an engaging element borne by the water craft or the mooring berth, and a lock borne by the mooring berth or the water craft, respectively. The lock includes two catch bars spaced out and extending vertically, at least a part of the engaging element being adapted to engaging between the two bars so as to be held by the lock and enabling the mooring of the water craft to the mooring berth. The catch bars are mobile relative to each other between a locking position in which the catch bars are brought closer to each other and maintain the engaging element and an unlocking position in which the catch bars are moved apart to enable the removal or insertion of the engaging element.