Stopping device of a container provided with a neck, whereby the device consists of a stopper and a plastic cap, suitable for covering both the neck and stopper placed on the neck, whereby the cap comprises a ring suitable for surrounding the stopper and the neck in mounted configuration and provided with locking means for locking to the neck, and a handling member of the ring provided with first means for transmitting a thrust force to the ring and second means for activating the locking means of the ring, while the ring and handling member, respectively, are provided with first retaining means and second retaining means that cooperate together to maintain the handling member with respect to the ring in a holding position where it does not activate the locking means of the ring: - the handling body being mobile, parallel to the direction of the thrust force and with respect to the ring, between a first position (fig. 14) where it activates the locking means of the ring and where it is mobile in translation only in the direction of the thrust force, and a second position (fig. 15) where it also activates the locking means of the ring and where it is immobilized with respect to the ring in axial translation in the two directions, according to a direction that is parallel to the thrust force - the handling body comprising - a first surface, cylindrical with a straight generatrix or in the shape of truncated cone, arranged facing the first retaining means of the ring, on the course of travel of the handling member between its first and second positions, and - a second surface, cylindrical with a straight generatrix or in the shape of a truncated cone, arranged facing the locking means of the ring on the course of travel of the handling member between its first and second positions, characterized - in that the locking means of the ring consists of locking tabs that extend from a first continuous edge of this ring in the direction of the second edge of the ring opposite its first edge, - in that the diameter of a circle that passes by the external radial parts of the locking tabs has a value that is higher than the external diameter of the first edge and - in that each locking tab is arranged in an opening with closed contour which crosses the ring according to a radial direction in relation to a longitudinal and central axis of the ring. - the handling body being mobile, parallel to the direction of the thrust force and with respect to the ring, between a first position (fig. 14) where it activates the locking means of the ring and where it is mobile in translation only in the direction of the thrust force, and a second position (fig. 15) where it also activates the locking means of the ring and where it is immobilized with respect to the ring in axial translation in the two directions, according to a direction that is parallel to the thrust force - the handling body comprising - a first surface, cylindrical with a straight generatrix or in the shape of truncated cone, arranged facing the first retaining means of the ring, on the course of travel of the handling member between its first and second positions, and - a second surface, cylindrical with a straight generatrix or in the shape of a truncated cone, arranged facing the locking means of the ring on the course of travel of the handling member between its first and second positions, characterized - a first surface, cylindrical with a straight generatrix or in the shape of truncated cone, arranged facing the first retaining means of the ring, on the course of travel of the handling member between its first and second positions, and - a second surface, cylindrical with a straight generatrix or in the shape of a truncated cone, arranged facing the locking means of the ring on the course of travel of the handling member between its first and second positions, characterized - in that the locking means of the ring consists of locking tabs that extend from a first continuous edge of this ring in the direction of the second edge of the ring opposite its first edge, - in that the diameter of a circle that passes by the external radial parts of the locking tabs has a value that is higher than the external diameter of the first edge and - in that each locking tab is arranged in an opening with closed contour which crosses the ring according to a radial direction in relation to a longitudinal and central axis of the ring.