PROBLEM TO BE SOLVED: To provide a gas sterilization method and a gas sterilization apparatus in a room in a medical facility or the like. SOLUTION: a) a radical generation step of generating a plasma species by bubbling in a liquid to generate a radical species, b) a radical diffusion step of diffusing radicals in the liquid, and the steps a and b are realized. A gas sterilization method, characterized in that the above configuration is provided inside the vehicle, and the vehicle has an inlet and an outlet, and air outside the vehicle is ventilated into the vehicle to sterilize gas. . Also, a gas sterilization processing apparatus for embodying the gas sterilization processing method. [Selection diagram] FIG.【課題】医療施設等における室内の気体滅菌処理方法および気体滅菌処理装置の提供。【解決手段】a)液中でのバブリングによるプラズマ放電を起こし，ラジカル種を生成するラジカル生成種工程，b)当該液中のラジカルを拡散するラジカル拡散工程，これらaおよびbの工程を具現化する構成を駆体内部に備えるとともに，前記駆体に吸入口と吐出口を備え，駆体外部の空気を駆体内部に通風させ，気体の滅菌処理を行うことを特徴とする気体滅菌処理方法。ならびに気体滅菌処理方法を具現化するための気体滅菌処理装置。【選択図】図３
