Abstract: A dosing device (1, 31) comprises a storage vessel (16, 36) for a substance to be dosed and a feed means (5) which transports the substance to a discharge opening (3) of the dosing device. A storage vessel (16, 36) is connected to the feed means (5) in such a way that the vessel is sealed off from the outside on all sides and there is provided in the wall of the storage vessel (16, 36) a closure element (21, 41) which, when the storage vessel (16, 36) is emptied, is subjected to a force which is caused by the external air pressure and has the effect that the shape of the storage vessel (16, 36) can be changed in the region of the closure element (21, 41). Further there is provided indicating means (18, 38) assigned to the movement of the closure element (21, 41) with the effect that the extent of movement of the closure element (21, 41), and consequently the amount of substance discharged, can be indicated.