Capping device, intended to be fixed on a neck of a container in order to seal an orifice of said neck, said neck comprising an engaging collar, comprising the capping device: - a cap comprising an upper wall and an outer peripheral skirt, the cap being suitable to be arranged in a closed position in which the upper wall closes the orifice of the neck and the peripheral skirt surrounds said neck; - a ring located under the cap in the closing position and comprising a first section intended to be axially retained in the engaging collar of the neck and a second section, the first section and the second section of the ring being articulated to each other so that the second section pivots with respect to the first section from a lowered position to a raised position to allow the cap to move axially away from the neck from the closed position to a released position in which said cap is no longer inside the neck of the container; and - an articulation device that connects the cap to the second section of the ring, the articulation device being configured to allow the cap to pivot along an axis of rotation between said released position and a tilted open position in which the plug is released from the orifice of the neck; wherein the cap comprises a male fixing element formed in the outer peripheral skirt and protruding radially outward from the cap, and the second section of the ring comprises a female fixing element, the male fixing element of the cap and the female fixing element of the ring being configured to cooperate with each other to maintain the cap with respect to the ring in the tilted open position, characterized in that the male fixing element comprises a lug which protrudes axially upward when the cap is in the tilted open position, and the female fixing element comprises a housing provided on the ring and a heel made on an outer surface of the ring, partially covering the housing and projecting axially downwards, the lug being configured to be inserted and retained in the housing after elastic deformation of the male fixing element when the heel passes, the heel thus forming a stop for the lug in the tilted open position, and and in that the housing is delimited downward by a lower surface against which the lug is configured to abut during movement of the cap toward the tilted open position in order to exert on the ring a downwardly directed force that allows the second section of the ring to be brought back to the lowered position. - a cap comprising an upper wall and an outer peripheral skirt, the cap being suitable to be arranged in a closed position in which the upper wall closes the orifice of the neck and the peripheral skirt surrounds said neck; - a ring located under the cap in the closing position and comprising a first section intended to be axially retained in the engaging collar of the neck and a second section, the first section and the second section of the ring being articulated to each other so that the second section pivots with respect to the first section from a lowered position to a raised position to allow the cap to move axially away from the neck from the closed position to a released position in which said cap is no longer inside the neck of the container; and - an articulation device that connects the cap to the second section of the ring, the articulation device being configured to allow the cap to pivot along an axis of rotation between said released position and a tilted open position in which the plug is released from the orifice of the neck; wherein the cap comprises a male fixing element formed in the outer peripheral skirt and protruding radially outward from the cap, and the second section of the ring comprises a female fixing element, the male fixing element of the cap and the female fixing element of the ring being configured to cooperate with each other to maintain the cap with respect to the ring in the tilted open position, characterized in that the male fixing element comprises a lug which protrudes axially upward when the cap is in the tilted open position, and the female fixing element comprises a housing provided on the ring and a heel made on an outer surface of the ring, partially covering the housing and projecting axially downwards, the lug being configured to be inserted and retained in the housing after elastic deformation of the male fixing element when the heel passes, the heel thus forming a stop for the lug in the tilted open position, and and in that the housing is delimited downward by a lower surface against which the lug is configured to abut during movement of the cap toward the tilted open position in order to exert on the ring a downwardly directed force that allows the second section of the ring to be brought back to the lowered position.