MEMBRANE HUMIDIFIER FOR FUEL CELL

Disclosed is a membrane humidifier for a fuel cell, which can prevent, without a separate gas filtering device, performance deterioration of a fuel cell due to harmful gases during a humidifying process. The membrane humidifier (100) for a fuel cell according to the present invention comprises:a housing unit comprising a first fluid inlet (121) for introduction of a first fluid, a first fluid outlet (122) for discharge of the first fluid, a second fluid inlet (112) for introduction of a second fluid, and a second fluid outlet (113) for discharge of the second fluid, humidity of the first fluid introduced through the first fluid inlet (121) being lower than humidity of the second fluid introduced through the second fluid inlet (112);a plurality of hollow fiber membranes (160) disposed inside the housing unit in such a way that moisture exchange between the first fluid flowing along lumens of the hollow fiber membranes (160) and the second fluid flowing outside the hollow fiber membranes (160) occurs; anda first gas filter (250) provided in the housing unit, the gas filter being configured to capture harmful gas included in the first fluid, the harmful gas comprising nitrogen oxide (NOx), sulfur oxide (SOx), ammonia (NH3), or a mixture of two or more thereof,wherein the first gas filter (250) comprises:a first filter portion; anda first frame portion (255) coupled to the first filter portion in such a way as to surround the first filter portion, the first frame portion (255) being coupled to the housing unit and having an overall shape corresponding to a sectional shape of the housing unit.