PROBLEM TO BE SOLVED: To enhance productivity of a sterility package in an inline system.SOLUTION: The sterility filling device comprises: preform transport means for transporting a PET-made preform 1 on a first transport path transport means for die for transporting a molding die 4 for container on a second transport path connected to the first transport path and transport means for container for transporting a container molded by the die on a third transport path connected to the second transport path. Hydrogen peroxide gas is sprayed to the preform from a nozzle for preliminary sterilization for preliminary sterilization, the preform is heated by a heater 19b, then the hydrogen peroxide gas G is sprayed to the preform from a nozzle 6 for sterilization for sterilization, and then the preform subjected to heating and sterilization is received on the die and subjected to blow molding for forming a container, then filling and sealing of content are sequentially performed to the container which was subjected to blow molding, by a filler and a capper. To a gray zone corresponding from the first transport path to the second transport path in a chamber, air which is purified by a HEPA is blown always.
