CARTRIDGE FOR FUEL CELL HUMIDIFIER, AND FUEL CELL HUMIDIFIER

The present invention relates to: a cartridge for a fuel cell humidifier for humidifying dry gas supplied from the outside by using wet gas discharged from a fuel cell stack; and a fuel cell humidifier, the cartridge comprising: an inner case having an opening at the end thereof, and having a plurality of hollow fiber membranes contained therein; and a first gas inlet and a first gas outlet formed to be spaced from each other in a first axial direction in the inner case, wherein: the inner case comprises a first segment having the hollow fiber membranes contained therein, a second segment spaced from the first segment on the basis of a second axial direction that is vertical with respect to the first axial direction, and a third segment positioned between the first segment and the second segment on the basis of the second axial direction; and the average thickness of the third segment is thinner than each of the average thickness of the first segment and the average thickness of the second segment.