A hollow fiber membrane module, comprising: a hollow fiber membrane mat laminate; a header providing a water collection channel to which a distal end of the mat laminate is exposed and providing an insertion space into which one end of the mat laminate is inserted; a hollow fiber membrane binding unit pressing and binding the one end of the mat laminate and inserted into and coupled to the insertion space; and a potting layer adhesively holding the one end of the mat laminate to seal the water collection channel; characterized in that the mat laminate has a first holding band adhesively holding a side portion of one end of the hollow fiber membrane and a second holding band spaced apart from the first holding band; the hollow fiber binding unit has a first projecting post supporting an edge of the first holding band; and a second projecting post protruding between the hollow fiber membranes to support a portion of the mat between the first holding band and the second holding band the hollow fibre binding unit further comprises a first longitudinal wall portion and a second longitudinal wall portion each having a through-slit (211, 231), inner walls of the first and second longitudinal wall portions (210, 230) facing each other to press and bind the one end of the mat laminate; and transverse wall portions connecting both ends of the first longitudinal wall portion to both ends of the second longitudinal wall portion, respectively; an upper mat holding portion (215, 235) protruding inward from an entrance side edge of each of the first and second longitudinal wall portions, at which the hollow fiber membranes of the mat laminate extend outward, wherein the upper mat holding portion (215, 235) presses and holds the mat laminate; a lower mat holding portion (213, 233) protruding inward from an open bottom side edge of each of the first and second longitudinal wall portions adjacent to the one end of the mat laminate, wherein the lower mat holding portion (213, 233) presses and holds the mat laminate; wherein the mat laminate comprises mats in which hollow fiber membranes are arranged side by side; and wherein the first projecting post protrudes from an inner wall of the first longitudinal wall portion and serves as a reference with respect to which one end of the mat is aligned; and wherein the second projecting post is spaced apart from the first projecting post and protrudes from the inner wall of the first longitudinal wall portion to pass between the hollow fiber membranes of the mat laminate. a hollow fiber membrane mat laminate; a header providing a water collection channel to which a distal end of the mat laminate is exposed and providing an insertion space into which one end of the mat laminate is inserted; a hollow fiber membrane binding unit pressing and binding the one end of the mat laminate and inserted into and coupled to the insertion space; and a potting layer adhesively holding the one end of the mat laminate to seal the water collection channel; characterized in that the mat laminate has a first holding band adhesively holding a side portion of one end of the hollow fiber membrane and a second holding band spaced apart from the first holding band; the hollow fiber binding unit has a first projecting post supporting an edge of the first holding band; and a second projecting post protruding between the hollow fiber membranes to support a portion of the mat between the first holding band and the second holding band the hollow fibre binding unit further comprises a first longitudinal wall portion and a second longitudinal wall portion each having a through-slit (211, 231), inner walls of the first and second longitudinal wall portions (210, 230) facing each other to press and bind the one end of the mat laminate; and transverse wall portions connecting both ends of the first longitudinal wall portion to both ends of the second longitudinal wall portion, respectively; an upper mat holding portion (215, 235) protruding inward from an entrance side edge of each of the first and second longitudinal wall portions, at which the hollow fiber membranes of the mat laminate extend outward, wherein the upper mat holding portion (215, 235) presses and holds the mat laminate; a lower mat holding portion (213, 233) protruding inward from an open bottom side edge of each of the first and second longitudinal wall portions adjacent to the one end of the mat laminate, wherein the lower mat holding portion (213, 233) presses and holds the mat laminate; wherein the mat laminate comprises mats in which hollow fiber membranes are arranged side by side; and wherein the first projecting post protrudes from an inner wall of the first longitudinal wall portion and serves as a reference with respect to which one end of the mat is aligned; and wherein the second projecting post is spaced apart from the first projecting post and protrudes from the inner wall of the first longitudinal wall portion to pass between the hollow fiber membranes of the mat laminate.