PROBLEM TO BE SOLVED: To provide a sterilizer and a sterilizing method, for eliminating bacteria in a space which may have high humidity.SOLUTION: This sterilizer includes: an air passage 5 for sucking gas in a space 1 to be sterilized into a treatment space 4 and returning the gas to the space 1 by the function of a blowing means 3 a microplasma generation means 6 provided in the treatment space 4 and dew condensation prevention means 7 heating the gas to prevent dew condensation. The microplasma generation means 6 includes: a pair of electrode plates 8 disposed substantially parallel to each other and a voltage application device. Each of the pair of electrode plates 8 has a plurality of through holes formed in the thickness direction of the electrode plate. At least one of the surfaces facing each other of the pair of electrode plates 8 includes a dielectric layer. The dew condensation prevention means 7 are provided on the upstream side of the microplasma generation means 6 in a flowing direction of the gas, in the treatment space 4 or in the air passage 5.COPYRIGHT: (C)2013,JPO&INPIT【課題】高湿度状態となることがある空間において良好に除菌を行える除菌装置及び除菌方法を提供することにある。【解決手段】送風手段3の働きにより、除菌対象空間1内の気体を処理空間4に吸引して除菌対象空間1に戻す送風路5と、処理空間4に設けられたマイクロプラズマ発生手段6と、気体を加熱し結露を防止する結露防止手段7と、を備え、マイクロプラズマ発生手段6が、互いに略平行に配置される一対の電極板8と、電圧印加装置とを備えて構成されるとともに、一対の電極板8の夫々に、複数の貫通孔を電極板の厚み方向に形成して構成され、一対の電極板8の対向する表面の少なくとも一方に誘電体層が形成されるとともに、結露防止手段7が、処理空間4内若しくは送風路5において、気体の流れ方向においてマイクロプラズマ発生手段6の上流側に設けられた除菌装置。【選択図】図1
