PROBLEM TO BE SOLVED: To provide an adsorption/desorption type concentration device for achieving high concentration rate while securing recovery efficiency of a material.SOLUTION: The adsorption/desorption type concentration device having an adsorption rotor 1 includes: a humidifying means 10 for regeneration which humidifies air RA for regeneration passing through a regeneration zone 3 and a humidifying means 13 for purging which humidifies air PA for regeneration passing through a purge zone 4.