Beverage dispenser

A beverage dispenser comprising a raw water container for holding drinking water therein, said container having an outlet port, a container connecting portion to which the outlet port of the raw water container can be connected with the outlet port facing downward, a tank provided under the connecting portion for holding drinking water dropped from the raw water container, an outlet valve through which drinking water in the tank can be dispensed, a water passage tube provided at the container connecting portion and inserted upwardly into the outlet port of the raw water container, said water passage tube being formed with a water passage hole through which drinking water in the raw water container passes and which has a first opening at a bottom end portion thereof, a water passage pipe which is connected the first opening and through which drinking water drops into the tank, and a first on-off valve provided at a free end of the water passage pipe and configured to open when the water level in the tank lowers, wherein the raw water container has a side wall which is sufficiently flexible such that as drinking water in the container drops, the container is gradually collapsed under atmospheric pressure, characterized in that the interior of the water passage tube has a cross-section which is partitioned into a water passage through which the water passage hole communicates with the first opening, and an air passage communicating with a small air passage hole which opens to the water passage or the interior of the outlet port and having a second opening at a lower end portion of the air passage, and that the beverage dispenser further comprises an air passage pipe connected to the second opening and hanging into the tank, and a second on-off valve provided at a free end of the air passage pipe and configured to open when the water level in the tank lowers.