the invention relates to a closure cap which is preferably produced according to a plastic injection moulding method and provided with a closure stopper which can be placed on a neck opening which is also preferably made of plastic , said neck opening being that of a bottle container . the closure cap is provided with a bottom and the closure stopper is formed on the inner side of the cap bottom opposite the neck opening . in order to create a functionally secure stopper , said closure stopper is arranged on a plane in a parallel position with regard to the cap bottom such that it can pivot in relation thereto .