The present invention provides a filter member having excellent handling properties when preparing the element and module for membrane separation from the filter member featuring a high porosity and excellent filtering capacity, and excellent durability as filters for waste water treatment. A filter member comprises a porous filter membrane of a synthetic resin and a water-permeable reinforcing sheet laminated on the membrane wherein the membrane and sheet are joined by spot-bondings scattered over an interfacial phase of lamination with the area of spot-bondings at any portion thereof being in the range of 0.05-0.35 cm<2> per 1 cm<2> of said interfacial phase.
