To simplify working in the manufacturing or taking off a seal in a wrapping structure of a liquid container.

This wrapping structure 11 of an ink cartridge is equipped with an ink cartridge 12 and a vacuum pack bag 14 covering the whole part of the ink cartridge 12. The vacuum pack bag 14 is formed such that one end 14a and the other end 14b of a cylindrically formed film material are thermally welded. The ink cartridge 12 is accommodated in the vacuum pack bag 14 and a projection 25 is thermally welded to the inner side face of the vacuum pack bag 14. As a result, an ink supply hole 27 formed on the projection 25 is sealed with respect to the inner space 45 of the vacuum pack bag 14.