PROBLEM TO BE SOLVED: To provide the structure of a decontamination object room capable of swiftly reducing the concentration of a decontamination agent in the decontamination object room to an allowable concentration.SOLUTION: The structure of a decontamination object room (10) comprises: a measurement part (11) of measuring the temperature of the air in the decontamination object room an air-conditioning machine (12) of feeding clean air to the inside of the decontamination object room and a control part (13) of controlling the air-conditioning machine in such a manner that clean air at a temperature higher than the temperature measured in the measurement part is fed to the inside of the decontamination object room after the passage of a fixed time after the concentration of a decontamination agent in the decontamination object room starts to be reduced.COPYRIGHT: (C)2014,JPO&INPIT【課題】 除染対象室における除染剤の濃度を許容濃度まで迅速に減衰させることのできる除染対象室の構造。【解決手段】 本発明にかかる除染対象室(10)の構造は、除染対象室内の空気の温度を計測する計測部(11)と、除染対象室の内部へ清浄な空気を供給する空調機(12)と、除染対象室における除染剤の濃度が低下し始めてから一定時間が経過した後に、計測部で計測した温度よりも高い温度の清浄な空気を除染対象室の内部へ供給するように空調機を制御する制御部(13)とを備えている。【選択図】 図1