A hollow fiber membrane module that is of an external-pressure type, the hollow fiber membrane module comprising: a plurality of hollow fiber membranes ; a container storing the plurality of hollow fiber membranes ; a feed water inlet provided at one end portion of the container such that a direction in which feed water flows into the container is parallel to a longitudinal direction of the plurality of hollow fiber membranes ; a permeate water outlet provided at the other end portion of the container such that a direction in which permeate water flows to the outside of the container is parallel to the longitudinal direction; a concentrated water outlet provided at the other end portion of the container such that a direction in which the feed water flows from the container to outside of the container is perpendicular to the longitudinal direction; an outer net binding the plurality of hollow fiber membranes ; a first binding portion provided at one end portion of the plurality of hollow fiber membranes ; and a plate-like baffle having a plurality of through holes , the baffle being disposed between the feed water inlet and one end portion of the plurality of hollow fiber membranes in order to prevent flow of the feed water from directly colliding with the hollow fiber membranes and the first binding portion , wherein the plurality of hollow fiber membranes are sealed at the one end portion by the first binding portion , the plurality of through holes are provided in an outer circumferential portion of the baffle , and a permeation flux of the hollow fiber membranes at a transmembrane pressure difference of 0.1 MPa is higher than or equal to 850 liter/m 2 /h, measured as described in the examples of the description. a plurality of hollow fiber membranes ; a container storing the plurality of hollow fiber membranes ; a feed water inlet provided at one end portion of the container such that a direction in which feed water flows into the container is parallel to a longitudinal direction of the plurality of hollow fiber membranes ; a permeate water outlet provided at the other end portion of the container such that a direction in which permeate water flows to the outside of the container is parallel to the longitudinal direction; a concentrated water outlet provided at the other end portion of the container such that a direction in which the feed water flows from the container to outside of the container is perpendicular to the longitudinal direction; an outer net binding the plurality of hollow fiber membranes ; a first binding portion provided at one end portion of the plurality of hollow fiber membranes ; and a plate-like baffle having a plurality of through holes , the baffle being disposed between the feed water inlet and one end portion of the plurality of hollow fiber membranes in order to prevent flow of the feed water from directly colliding with the hollow fiber membranes and the first binding portion , wherein the plurality of hollow fiber membranes are sealed at the one end portion by the first binding portion , the plurality of through holes are provided in an outer circumferential portion of the baffle , and a permeation flux of the hollow fiber membranes at a transmembrane pressure difference of 0.1 MPa is higher than or equal to 850 liter/m 2 /h, measured as described in the examples of the description. <EOS>