Provided is a membrane module apparatus capable of allowing an aseptic connection member to be applicable to a hollow fiber membrane module and avoiding the need for a user to perform a sterilization treatment. A membrane module apparatus 1 comprises: a hollow fiber membrane module 10 to be filled with a liquid during steam sterilization； thermoplastic tubes 11, being aseptic connection members, for aseptically connecting the membrane module apparatus 1 to another duct； connecting tubes 12 for connecting liquid ports 20, 22 and 23 of the hollow fiber membrane module 1 respectively to the thermoplastic tubes 11； and closure members capable of pinching and closing the connecting tubes 12. The connecting tubes 12 have heat resistance to the steam sterilization. An expansion member 14 is connected to a liquid port 21 of the hollow fiber membrane module 10.
