A sterilization apparatus characterized in that the sterilization apparatus comprises a reactive oxygen irradiation unit for irradiating a reactive oxygen and an irradiation platform on which an object to be sterilized is placed, wherein the irradiation platform satisfies one or more selected from: (A): having a reactive oxygen shielding structure in at least one direction of an upper side, a lower side, or a horizontal direction of the object to be sterilized; (B): being made of a resin and/or made of a non-metal; and (C): being set within a closed space. The sterilization apparatus of the present invention shows excellent sterilization activity, so that it can be suitably used in, for example, sterilization of containers for foodstuff, bottle caps for sealing the openings of containers, medical devices, foodstuffs such as vegetables and meat, and the like.