HUMIDIFIER FOR FUEL CELL

The present invention relates to a humidifier for a fuel cell, the humidifier comprising: a humidifying module for humidifying a dry gas, supplied from the outside, by using a wet gas discharged from a fuel cell stack; and a first cap coupled to one end of the humidifying module, wherein the humidifying module includes: a mid-case that is open at both ends; at least one cartridge disposed inside the mid-case and including a plurality of hollow fiber membranes; and a first packing member which is air-tightly coupled to one end of the humidifying module through mechanical assembly so that the first cap is in fluid communication with only the hollow fiber membranes.