Abstract: Disclosed is a distillatory apparatus in which distilling chambers are disposed in array and the atmospheric pressures in the distilling chambers are selected to gradually lower in the order of them and maintained at such gradually decreased values. The distilling chambers are each supplied with an original liquid. The original liquid supplied to each distilling chamber flows on a partition wall between the distilling chamber and the adjacent one of higher atmospheric pressure. While flowing on the partition wall, the original liquid is heated to be evaporated and vapor makes contact with a partition wall on the side of the adjacent distilling chamber of lower atmospheric pressure and is cooled thereby to be condensed to a distilled liquid.