An adsorption rotor has a surface layer which can be detached and replaced when performance degrades. A metal aggregate is extended in the width direction of the rotor element so that attachment-and-detachment adsorption rotor elements can be attached thereto using bolts and a perimeter griddle fixing bracket, thus resulting in protecting an upper part of the integral-type adsorption rotor element. In this way, the weight of the attachment-and-detachment adsorption rotor elements can be made light, resulting in them being fixable only using bolts, without special tools or skilled technicians. Moreover, because the detachment-and-replacement procedures can be performed from a rotor spindle side, thus from inside of a chamber, a heavy industrial machine is not required.