Abstract: An apparatus for separating whey from a slurry-like material such as bean and dairy products, includes a screen, a jacket mantling the screen with a first space outside the screen and a second space inside the screen, wherein the first space provides a whey chamber of a size which allows the screen to be submerged in the whey staying therein after the whey is squeezed through the screen, a spiral screw rotatively housed in the screen, the blades of the screw being kept in contact with the wall surface of the screen such that the whey is prevented from reversely flowing; and a take-out port provided in the jacket so as to allow the whey in the first chamber to overflow therethrough.