To apply a certain direction against a tearing action at a seal opening section for a packing bag having a non-expected direction or vicious trace and the like for a seal opening section as a result of layer lamination and a bag formation, or a packing bag having no direction characteristic at all and having a similar degree of high strength in tearing in any direction.

A gas barrier laminated material 1 having more than one row of perforations for use in opening seal guiding action is used as a front or rear wall or front wall or rear wall at a section where the laminated material other than a gas barrier layer may become a seal opening section. In the case that both of them have a row of perforations R, these rows of perforations are aligned to each other at their positions and they are sealed at their peripheral edges.