PURPOSE: To reduce the device cost, make the device space smaller and suppress the increase of a container weight by a method wherein a preliminary molded item is sterilized by a germicide, and draw-blow-forming is performed by blowing a germfree pressurized gas, and a sterilized cap is tightened to fit on a container.

CONSTITUTION: At a sterilization process 1, a parison 5 fitted on a carrying rod 9 provided at the upper half side of a conveying belt 8 is gradually immersed in a germicide 11. The parison 5 is sterilized and heated close to the glass transition temperature. After pulling it up from the germicide 11, heated dry air is jetted to the inner surface of the parison 5. At same time, dry air is jetted also to the outer side of the parison 5, and the parison 5 becomes to be germfree. Then, at a draw-blow-forming/filling process 2, the parison 5 is fitted in a mold 21 for blow-forming, and in the parison 5, a germfree pressurized gas is injected, and the parison 5 is joined to the mold 21 and byaxially draw-blow-formed and becomes a bottle shaped container 23. The container 23 which is cooled after being sterilized and filled with a filling liquid 27 is carried to a rotary capping process 3. After fitting a previously sterilized cap, the container 23 is carried out by a second unfeeder star wheel 34 to the outside.