Humidifying module and its unit cell for fuel cell

A module for humidifying a fuel cell (5) and a unit cell (100) therein. The unit cell includes a first guiding plate (10), a second guiding plate (20), and an intermediate layer (30). The first guiding plate, communicating with the fuel cell, includes a plurality of first grooves (11) so that air flows to the fuel cell via the first grooves. The second guiding plate, communicating with the fuel cell, includes a plurality of second grooves (21) so that gas from the fuel cell flows out of the unit cell via the second grooves. The second grooves face the first grooves. The intermediate layer is disposed between the first guiding plate and the second guiding plate, and prevents the air flowing in the first grooves from mixing with the gas flowing in the second grooves. Water content in the gas flowing in the second grooves is transmitted to the first grooves.