PURPOSE: A humidifier for a fuel cell is provided to secure excellent humidification efficiency by maximizing the area of a film contacting a reactive gas and by uniformly utilizing all films inside the humidifier. CONSTITUTION: A humidifier(200) for a fuel cell comprises the following: a housing(210) including a reactive gas inlet; a hollow fiber membrane bundle(220) fixed on the inside of the housing; and a gas distributor(240) located in between the hollow fiber membrane bundle and the reactive gas inlet. The gas distributor includes multiple holes and is closely attached to the inner surface of the housing.
