Abstract: A closure device for closing a container, the closure device including a basic member, the basic member having a channel extending along a closure axis and having an inlet opening and a pouring opening, the closure device including a closure cap, the closure cap and the basic member being formed and arranged relative to each other in such a manner that the closure cap closes the pour-ing opening in a closed state of the closure device and releases it in an open state of the closure device. The closure cap is mounted on the basic member in the closed state of the closure device so as to be rotatable about the closure axis relative to the basic member, so that the closure cap is rotatable in an opening direction relative to the basic member, to bring the closure device into the open state.