HOLLOW FIBER MEMBRANE MODULE

A hollow fiber membrane module includes: a plurality of hollow fiber membranes ; a case that accommodates the plurality of hollow fiber membranes and has a case main body made of a resin and having openings at both ends thereof; and a pair of sealing and fixing portions and that seal a gap between the hollow fiber membranes in a state where a hollow inside of each of the hollow fiber membranes is kept open and fix the plurality of hollow fiber membranes to the case on both end sides of the case . In the case main body , a reinforcement portion that connects a pair of facing wall surfaces of inner wall surfaces for accommodating the plurality of hollow fiber membranes is integrally provided on the pair of wall surfaces.