The hollow fiber membrane module

PROBLEM TO BE SOLVED: To provide a hollow fiber membrane module which can prevent breakage of the hollow fiber membrane in a periphery of a boundary with a sealed part, and can prevent breakage caused by collision of the hollow fiber membrane with a net cylinder.SOLUTION: The hollow fiber membrane module includes: a housing 10 having an original liquid inlet 12 and a penetrated-liquid outlet 14; a plurality of hollow fiber membranes 1 housed in the housing 10; a plurality of inner layer net cylinders 2 which are formed by dividing the hollow fiber membranes 1 into plural parts and bundling; a single or a plurality of outer layer net cylinders 3 which bundle the plurality of the inner layer net cylinders 2; and a sealing part 4 which is arranged at least on one end side of the hollow fiber membranes and prevents mixture of an original liquid side flow passage and a penetration side flow passage. The outer layer net cylinder 3 has a thickness of more than 1.0 mm and a net fiber diameter of 0.9-5.0 mm. The inner layer net cylinder 2 has a thickness of 1.0 mm or less and a net fiber diameter of 0.1-1.0 mm.