To simplify a manufacturing process, reduce its manufacturing cost, and prevent environmental disruption in disposal after use.

A paper blank-plate in which a bottom 1 and side wall 2 are integrated is made out of base paper, such as cup base-paper. A paper container main body is made by placing the blank plate into a mold for vacuum or air- pressure forming, thereby making it into a box. Further, a package container with a film firmly joined to its entire inside is made by subjecting the heated thermoplastic resin inner protective film to vacuum or air-pressure forming inside the paper container main body, then stuff as contents 8 are filled into the package container, further, the package container is sealed under heat with a lid 10 attached to the flange of the package container, and thus a package body is made.