FUEL CELL MEMBRANE HUMIDIFIER

Disclosed is a fuel cell membrane humidifier capable of preventing the bypass of exhaust gas by sealing a gap between an inner case and a middle case which form a cartridge, wherein the disclosed fuel cell membrane humidifier comprises: a middle case having a partition dividing an inner space; a first cap fastened to one side of the middle case; a second cap fastened to another side of the middle case; an inner case, which is disposed in the middle case and accommodates a plurality of hollow fiber membranes therein; a rib, which protrudes from one side of the inner case and is in contact with one surface of the partition; a hook, which protrudes from another side of the inner case and is in contact with another surface of the partition; a first gasket, which is disposed between the first cap and the inner case and transmits, to the rib, a fastening force between the first cap and the middle case; and a second gasket, which is disposed between the second cap and the inner case and transmits, to the hook, the fastening force between the second cap and the middle case.