The container closure (1) consists of a spout (2) intended to be connected to a container and of a cap (3) that closes the spout. The latter is provided with two wings (6). From a sealing closed position, the cap (3) is movable by a twisting movement of less than 180 degrees to a released position in which it can be withdrawn from the spout (2). Stop means arranged on the spout (2) and on the cap (3) define the closed position. In addition, a locking member (11) may be provided in the cap (3) which only allows opening the latter after the rupture of a predetermined breaking point (18).