PROBLEM TO BE SOLVED: To shorten a time of aeration which conventionally requires a long period of time in sterilization work in an isolator.SOLUTION: The isolator is provided with: a work chamber that has an opening on the front surface and performs work with a cell as a subject a resin transparent plate member that is mounted to the work chamber in a manner so as to occlude the opening, and allows to see the inside of the work chamber and a work chamber sterilization device that supplies hydrogen peroxide gas into the work chamber to sterilize the interior of the work chamber, and then discharges the hydrogen peroxide gas in the work chamber. The isolator is further characterized in that at least the surface facing the work chamber of the plate member is formed in such a manner that hydrogen peroxide absorbency is not larger than a predetermined value.COPYRIGHT: (C)2013,JPO&INPIT【課題】アイソレータにおける滅菌作業のなかで従来、長時間を要していたエアレーションにかかる時間を短縮する。【解決手段】前面に開口部を有する細胞を対象とする作業を行うための作業室と、前記開口部を閉塞するように前記作業室に装着され、前記作業室内を視認可能な樹脂製の透明な板部材と、前記作業室内に過酸化水素ガスを供給して前記作業室内を滅菌した後、前記作業室内の過酸化水素ガスを排出する作業室滅菌装置と、を備え、前記板部材の少なくとも前記作業室に向かう側の面は、過酸化水素の吸収性が所定値以下となるように形成されることを特徴とするアイソレータ。【選択図】図1