To provide a hydrogen peroxide gas decontamination method and device, having a simple device configuration, and capable of easily decontaminating a decontamination objective space in a small-volume housing such as a safety cabinet and an isolator, by hydrogen peroxide gas.SOLUTION: A hydrogen peroxide gas decontamination device includes: a container 11 which is provided in a decontamination objective space K and into which a hydrogen peroxide solution is put； a heater 12 for heating the hydrogen peroxide solution in the container 11 by heating the container 11； and a temperature controller 13 which heat-controls the hydrogen peroxide solution to 70-90°C by controlling the heater 12. The device has such a simple device configuration that 200-400 ppm of hydrogen peroxide gas is obtained by heating the hydrogen peroxide solution to 70-90°C with the heater 12 in the decontamination objective space K, and can easily decontaminate the decontamination objective space in a small-volume housing such as a safety cabinet and an isolator, by hydrogen peroxide gas.SELECTED DRAWING: Figure 1【課題】簡単な装置構成であるとともに、安全キャビネットやアイソレーター等の等の小容積筐体中の除染対象空間を過酸化水素ガスによって容易に除染できる過酸化水素ガス除染方法および装置を提供する。【解決手段】除染対象空間Ｋに設けられて、過酸化水素水が入れられる容器１１と、この容器１１を加熱することで当該容器１１内の過酸化水素水を加熱するヒータ１２と、このヒータ１２を制御して過酸化水素水を７０～９０℃に加熱制御する温度調節器１３とを備え、ヒータ１２によって除染対象空間Ｋにおいて、過酸化水素水を７０～９０℃に加熱して、２００～４００ｐｐｍの過酸化水素ガスを得るので、簡単な装置構成であるとともに、安全キャビネットやアイソレーター等の等の小容積筐体中の除染対象空間を過酸化水素ガスによって容易に除染できる。【選択図】図１
