PACKAGING BAG

A packaging bag 1 obtained by fashioning a laminate 10 into the shape of a bag having a rectangular shape in plan view, the laminate 10 having a sheet-shaped substrate 3 made of a resin, a cushioningmaterial 7 made of a foamed resin sheet laminated further inward than the substrate 3, and sealant layers 9 laminated further inward than the cushioning material 7. In the packaging bag 1, a seal part13 extending in the direction orthogonal to a flow direction (MD direction) and having the sealant layers 9 sealed to each other is provided to one of the end edges of the foamed resin sheet in the flow direction. A notch 17 facing the other end edge of the foamed resin sheet in the flow direction is formed in the seal part 13. 种包装袋(1)，其是将层叠体以俯视呈矩形的袋状的方式而形成的，所述层叠体具有由树脂构成的片状的基材(3)、层叠于比基材(3)更靠内侧的由发泡树脂片构成的缓冲材料(7)、层叠于比缓冲材料(7)更靠内侧的密封层(9)。包装袋(1)在发泡树脂片的流动方向(MD方向)的个端缘处具备对密封层(9)彼此进行密封并且在与流动方向正交的方向上延伸的密封部(13)。在该密封部(13)中形成有朝向发泡树脂片的流动方向的另个端缘的切口(17)。