An apparatus for manufacturing an absorbent body according to the present invention includes a conveying unit (2) that conveys an aggregate (101) of absorbent fibers and a water-absorbent resin (102), a mixing unit (3) that accepts the aggregate of the absorbent fibers and the water-absorbent resin that were conveyed by the conveying unit and mixes the absorbent fibers and the water-absorbent resin, a chamber portion (4) that has an internal space (40) through which the absorbent fibers and the water-absorbent resin that were mixed in the mixing unit fall, a stacking portion (5) that is disposed below the chamber portion and has a recessed portion (531) in which the absorbent fibers and the water-absorbent resin that fall through the chamber portion are stacked, and a suction unit (6) that causes a negative pressure in the chamber portion.
