Water purifier membrane assembly

The invention provides a water purifier membrane module which can suppress the load of water flow on the front end of a membrane bundle in a hollow fiber membrane module and has high water permeability. A water purifier membrane module having, in order from the upstream side to the downstream side, a filter material filling part including a filter material layer on the outer peripheral side and a water passage on the inner peripheral side, a dispersion part connecting the filter material filling part and the hollow fiber membrane part, and comprising: a connection plate having a connection port; and a top plate for blocking the water flow discharged from the connection port, the ratio (X/Y) of the diameter (X) of the top plate to the diameter (Y) of the connection port being 1.5-5.0, and the gap (Z) between the connection plate and the top plate being 0.5-2.0 mm, and the hollow fiber membrane part housing a plurality of hollow fiber membranes comprising hollow fibers, and being configured so as to receive the