Hollow fiber membrane module

A hollow fiber membrane module comprising:

• a plurality of hollow fiber membranes;
• a binding portion binding the plurality of hollow fiber membranes at one end portions thereof;
• a cap having an internal space that communicates with each of the plurality of hollow fiber membranes, the cap being integrated with the binding portion;
• and
• a housing that houses the plurality of hollow fiber membranes and the binding portion, and that has one end portion to which the cap is attached,
• wherein the cap comprises:
• a sleeve that extends along a longitudinal direction of the hollow fiber membranes, and that surrounds the binding portion in a circumferential direction;
• and a shoulder portion located inward of the sleeve, and
• wherein an inner circumferential surface of the sleeve is joined to the binding portion, and an outer circumferential surface of the sleeve is in contact with the one end portion of the housing,
• the shoulder portion overlaps the binding portion in a radial direction of the hollow fiber membrane module,
• the shoulder portion is further joined to the binding portion, and
• the sleeve is wedge-shaped on a cross-section parallel to the longitudinal direction of the hollow fiber membranes.