The purpose of the present invention is to reduce costs of members constituting a separation membrane module as well as to impart a rigidity suitable for a separation membrane element and such a flexibility as to release aeration energy. The purpose is also to provide a separation membrane module with which, when part of the membrane elements constituting a separation membrane module have suffered a failure, it is easy to perform the associated maintenance, i.e., to replace or remove the failed membrane element. A separation membrane module (21) has an element unit, and the element unit is provided with: a shaft (9); a plurality of separation membrane elements (1) comprising a) a separation membrane pair having two separation membranes arranged so that transmissive-side surfaces thereof face each other, and a water catchment channel provided between the two separation membranes, and b) a sealing section for sealing between the separation membranes at an outer edge of the separation membranes; a suspended section (8) suspending the separation membrane elements (1) on the shaft (9); and a water catchment nozzle (7) communicating between the water catchment channel and the exterior of the separation membrane elements.