A screw conveyor type separation apparatus (10, 20), comprising: a casing having an opening provided at one of end portions thereof, the opening enabling a treatment object that has been squeezed to be discharged therefrom, the casing having a substantially cylindrical shape; a screw shaft penetrating inside the casing along a longitudinal direction of the cylindrical shape of the casing; a first screw blade that is spirally provided on an outer peripheral surface of the screw shaft in the casing and that rotates with rotation of the screw shaft around a shaft center thereof; and a second screw blade that is spirally provided on the outer peripheral surface of the screw shaft in the casing, that is provided side by side with the first screw blade with a predetermined interval from the first screw blade, along a longitudinal direction of the screw shaft, and that rotates with the rotation of the screw shaft around the shaft center thereof, wherein in the casing, a first region and a second region substantially divided from each other by the first screw blade and the second screw blade are formed, and the screw conveyor type separation apparatus (10, 20) is configured to be able to, by the rotation of the screw shaft: in the first region, squeeze the treatment object while moving the treatment object in a predetermined direction towards the one of end portions, separate a liquid component from the treatment object, and move the liquid component to the second region; and in the second region, move the liquid component oppositely to the predetermined direction and discharge the liquid component to outside, wherein an input port is provided at the casing, the input port is configured to allow the treatment object to be fed into the casing, and is such that a region of an opening portion of the input port and a region of the second region overlap along a horizontal direction thus defining an overlap region; wherein a screw cover is provided between the first screw blade and the second screw blade, the screw cover covering at least the overlapping region so as to prevent the treatment object from being fed into the second region. a casing having an opening provided at one of end portions thereof, the opening enabling a treatment object that has been squeezed to be discharged therefrom, the casing having a substantially cylindrical shape; a screw shaft penetrating inside the casing along a longitudinal direction of the cylindrical shape of the casing; a first screw blade that is spirally provided on an outer peripheral surface of the screw shaft in the casing and that rotates with rotation of the screw shaft around a shaft center thereof; and a second screw blade that is spirally provided on the outer peripheral surface of the screw shaft in the casing, that is provided side by side with the first screw blade with a predetermined interval from the first screw blade, along a longitudinal direction of the screw shaft, and that rotates with the rotation of the screw shaft around the shaft center thereof, wherein in the casing, a first region and a second region substantially divided from each other by the first screw blade and the second screw blade are formed, and the screw conveyor type separation apparatus (10, 20) is configured to be able to, by the rotation of the screw shaft: in the first region, squeeze the treatment object while moving the treatment object in a predetermined direction towards the one of end portions, separate a liquid component from the treatment object, and move the liquid component to the second region; and