To prevent the deformation during the high-pressure steam sterilization treatment, and observe an inside of a container, by forming a package body by adhering the peripheral edges of the front and back films, liquid-tightly and removably adhering an edge part of a gas shielding film to an adhesion sealed face, and making a removed film transparent.

A package body 1 for packing a chamber storing a medicine which is easily deteriorated by oxygen, of a plastic container 3 which stores the medicine which is easily deteriorated by oxygen, is formed by a front film 4, a back film 5, and a gas shielding film 6. The specific areas of the peripheral edges of the front and back films 4, 5, are adhered and sealed to form an adhesion sealed face 7. An edge of the gas shielding film 6 having an oxygen gas non-permeable metallic layer, is liquid-tightly adhered around a part 7A of the edge of the adhesion sealed face 7. The gas shielding film 4 is removed by cutting the edge part 7A. The film from which the gas shielding film is removed, of the removal part is made transparent. Whereby the insertion of oxygen, and the deformation can be prevented, and the inside of the container can be confirmed.