<；P>；PROBLEM TO BE SOLVED: To provide an inexpensive hollow fiber membrane module which uniformizes the stream of a treatment liquid in a casing tube and which is capable of enhancing the treatment efficiency of a treatment liquid. <；P>；SOLUTION: The hollow fiber membrane module has the casing tube equipped with an entrance port of the treatment liquid at the side of one end part and an exit port of the treatment liquid at the side of the other end part, a hollow fiber membrane bundle internally mounted to the casing tube and a partition having the hollow fiber membrane bundle fixed to the inner wall of the casing tube in both the ends of the hollow fiber membrane bundle. The diameter of the inner peripheral face of the trunk part of the casing tube is expanded towards the exit port of the treatment liquid from the entrance port of the treatment liquid. <；P>；COPYRIGHT: (C)2006,JPO&NCIPI
