To provide a method and apparatus for appropriately sucking air in a packaging material for packaging laminated sheets wherein obtained packages can be efficiently transferred without load shifting and wherein no defective articles occurs.

When a volume 26E does not exist in a lightproof bag 28, a press cylinder 796 which constitutes a pressing means 790 is driven to lower a cushion member 799 to pressurize the lightproof bag 28 to reduce a volume in a space. In this state, air in the bag 28 is removed by a predetermined amount by a deaerating pipe 752 between a region on a downstream of the cushion member 799 in a transfer direction and the member 799.