Manufacturing method for packaged medicine administering device

A manufacturing method for a packaged medicine administration device that comprises a medicine administration device comprising an outer tube filled with a medicine, and a puncture device for medicine administration;

• a cylindrical case encapsulating and holding the medicine administration device;
• and a package accommodating the cylindrical case-encapsulated medicine administration device encapsulated and held by the cylindrical case, the package being sealed, the manufacturing method comprising:
• a step of preparing the cylindrical case-encapsulated medicine administration device;
• a step of adding hydrogen peroxide to a site to be located on an inner side of the cylindrical case of the cylindrical case-encapsulated medicine administration device;
• a step of accommodating the cylindrical case-encapsulated medicine administration device in the package;
• a step of sealing the package accommodating the cylindrical case-encapsulated medicine administration device;
• and
• a step of sterilizing the cylindrical case-encapsulated medicine administration device with a hydrogen peroxide atmosphere formed by the added hydrogen peroxide in a state in which the package is sealed.