HOLLOW FIBER MEMBRANE MODULE

A hollow fiber membrane module includes a pair of plate-shaped portions for forming a passage for a fluid that flows through exteriors of a plurality of hollow fiber membranes between an inner circumferential surface of a case and the plurality of hollow fiber membranes, the pair of plate-shaped portions are provided with a plurality of through holes that serve as a passage for the fluid that flows through the exteriors, and in a region where the plurality of through holes are provided in the pair of plate-shaped portions, a proportion of a total area of the plurality of through holes relative to a total surface area of a side, where the plurality of hollow fiber membranes are disposed, is 30% or more, and a width of each through hole in a direction parallel to the plurality of hollow fiber membranes is 10 mm or less.