The invention relates to a device for stopping a container (1) having a neck (12), said device comprising a stopper (51) and a cap (52) consisting of a plastic material and able to surround both the stopper (51) and the neck (12). The cap (52) comprises a ring (53) that can surround the stopper and the neck when mounted and is provided with means (537) for locking onto the neck, and a body (54) for handling the ring, provided with first means for transmitting a thrust force to the ring and second means (541) for activating means for locking the ring. The ring (53) is provided with a continuous outer peripheral collar (5311), and the handling body (54) is provided with at least one raised element (5431) designed to abut (E4) against the continuous outer peripheral collar (5311) when it activates the locking means (537).
