PURPOSE:To improve chemical resistance and heat resistance of a filtration module by arranging a large number of hollow fibrous semi-permeable membranes almost linearly in an outer casing and by making use of a thermoplastic resin raw material in at least wetted parts of module members. CONSTITUTION:A large number of hollow fibrous semi-permeable membranes 1 are arranged almost linearly in an outer casing 4, which has an outlet port 2 for a permeating liquid and an inlet port 3 for a liquid to be treated. Both and parts of the hollow fibrous semipermeable membranes are bundled, fused together with a thermoplastic resin of the same raw material as that of the semi-permeable membranes and sealed within the outer casing 4. Then, a filtration module is completed by attaching cap parts 11 of outer casing. The chemical resistance and heat resistance of the module is improved, because at least wetted parts of members constituting the module are thus made of the thermoplastic resin.
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