PROBLEM TO BE SOLVED: To provide a packaging bag in which it is difficult to absorb a medicinal component or the like of a stored item and welding layers of a base material are sufficiently welded to each other. SOLUTION: In the packaging bag 10 in which the welding layers 14 of the base material are welded to each other and the welding layers 14 are inside, the welding layer 14 is made of a biaxially stretched polyester film or a fluororesin film, and the welding portion between the welding layers 14 is formed. Is a laser welded part. [Selection diagram] Figure 2【課題】収納物の薬効成分等を吸収しにくく基材の溶着層同士が十分に溶着された包装袋を提供する。【解決手段】基材の溶着層１４同士が溶着され溶着層１４が内側となった包装袋１０において、溶着層１４が二軸延伸ポリエステルフィルム又はフッ素樹脂フィルムからなり、溶着層１４同士の溶着部がレーザー溶着部であることを特徴とする。【選択図】図２
