To surely guide a web traveling in a curved traveling passage by blown-off air to efficiently process the same in a double-faced floater-type dryer, a double-face floater-type cooler and a double-faced floater-type humidifier.

In this double-faced floater-type dryer capable of supporting the web 3 traveling in the curved traveling passage L by blown-off air in non- contact state to dry the web 3 from its both faces, a positive pressure generation nozzle 15 generating the positive pressure to the web 3 is mounted on a unit 32 inside of a curved face of the curved traveling passage L, and a negative pressure generation nozzle 19 generating the negative pressure or the positive pressure weaker than the positive pressure generated by the positive pressure generating nozzle 15 to the web 3, is mounted on a unit 13 outside of the curved face of the curved traveling passage L.