The present invention relates to a raised floor of the perforated panel, the damper control apparatus, the conventional damper device is a slide plate movable also tilted slightly easier porous adjustment of the porous panel has changed state, so the indoor air flow and on / humidity control and dust falls, the effect of such, there is a rack-and-pinion gear coupling state is bad to a porous adjustment is well designed to work assembling the damper panel sex good long that rather low productivity problem. Accordingly, the invention is an air hole (121, 131) while moving since the rack gear 133, the front / in the movable plate 130 in accordance with the direction for rotating the pinion 123, shaft 124 for the fixing plate 120 in constituting the open and closed damper panel 110, the value on either side of the rack gear 133, a groove (133a) to form a (133b), one value groove (133a) has a pinion (123 existing fixing plate 120 ) for the coupling and, the other side has a stopper portion 162 for fitting the elastic side rack gear to the rack gear and a pinion that give push elastically toward the pinion at the other end of the coupling state of the casing 160 is fixed to the fixing plate 120 that has the effect of always satisfactorily by the movement of the movable plate, accurate, easy to assembly of the damper and the panel, the adjustable position of the movable plate so well controlled by the other end of the stopper elastic unit time reduction and quality improvement and productivity improvement.