PROBLEM TO BE SOLVED: To provide a fungus treatment mechanism and a fungus treatment method capable of reliably sterilizing the exterior of an article. SOLUTION: A bacterial treatment unit having a space for performing bacterial treatment, a radiation irradiation unit that irradiates the bacterial treatment unit with radiation for performing bacterial treatment, and an air supply duct for supplying air to the bacterial treatment unit. It includes a decontamination treatment fluid supply unit that supplies the decontamination treatment fluid to the air supply duct at the time of initial decontamination of the air supply duct, and an exhaust duct that exhausts molecules in the fungus treatment unit.［課題］確実に物品の外装を滅菌することができる菌処理機構および菌処理方法を提供する。［解決手段］菌処理を行う空間を有する菌処理部と、菌処理部に菌処理を行うための放射線を照射する放射線照射部と、菌処理部に給気を行うための給気ダクトと、給気ダクトの初期除染時に除染処理流体を給気ダクトに供給する除染処理流体供給部と、菌処理部内の分子を排気する排気ダクトとを備える。
