A sterilization method using a liquid sterilizer comprising hydrogen peroxide, said liquid sterilizer being prepared by dissolving hydrogen peroxide in a solvent, wherein a liquid having a boiling point lower than 100oC is used as the solvent. By sterilizing a molded plastic container typified by a polyethylene terephthalate bottle or a paper container by attaching a mist of the aforesaid liquid sterilizer comprising hydrogen peroxide thereto, sterilization effect and sterilization efficiency can be increased and the amount of the sterilizer remaining in the container can be reduced.
