PROBLEM TO BE SOLVED: To apply high pressure steam sterilization as a final step by separating a molding step for a container body 10 and a liquid medicine filling step from each other.SOLUTION: A container body 10, an inside plug 20, and a cap 30 are combined together. The cap 30 has a pressing part 33 for pressing a flange part 22 of the inside plug 20 to bring it into pressure contact with an upper end surface of a mouth 12 of the container body 10. The container body 10 is filled with a liquid medicine. The inside plug 20 and the cap 30 are attached to the mouth 12, and high pressure steam sterilization is applied. Thus, the flange part 22 is bonded to the upper end surface of the mouth 12.
