NOVELTY - The humidifier has humidity and temperature sensors (34,35) that measure humidity and temperature of the condensed water generated in the reaction gas mixing process. Inner and outer containers (22,23) cover the sensors within the humidity measuring compartment of the second condensation water removing unit.    USE - Humidifier for fuel cell.    ADVANTAGE - Ensures excellent ultrasonic humidification, and generates suitable wet response rate. The moisture necessary for humidification using the ultrasonic oscillator is effectively condensed. Improves mixing precision since the reactive gas diffused through the gas service pipe and gas diffuser is mixed in the reaction gas mixing portion. Ensures that moisture and the atomized reaction gas are heated up to reach an appropriate temperature to maintain the proper humidification amount. Reduces measurement errors, thus ensuring accurate detection of the humidified reaction gas mixed in the reaction gas mixing portion and ejected to the gas exhausting tube with the rotation of the fan after the first removing condensation water process and the second removing condensation water process. Ensures that the sensors can easily detect humidified reaction gases that flowed into various meshed partition walls positioned between the reaction gas mixing portion and humidity measurement department and ejected to the gas exhausting tube. Maintains the required humidification temperature in the humidifier and the inner container to control the humidity of the reaction gas and the water content contained in the reaction gas. Reduces the heating of the inner container by reducing the electricity in water clarified in the ultrasonic oscillator specification by the water level sensor using the water in the inner container.    DESCRIPTION OF DRAWING(S) - The drawing shows the configuration diagram of the humidifier. (Drawing includes non-English language text)    Control device (20)    Inner container (22)    Outer container (23)    Humidity sensor (34)    Temperature sensor (35)