PROBLEM TO BE SOLVED: To provide a packaging bag which facilitates taking out of contents, when the packaging bag is opened, by being opened transversely from an opening notch of the packaging bag to an oblique direction of circumference, and exposing a part of the contents, and which is excellent in processing aptitude, distribution suitability and use aptitude.SOLUTION: A packaging bag having a cylindrical structure is obtained by thermally bonding, like hands placed together, both side ends of packaging material composed of laminate having a heat-sealable resin layer at an innermost layer, to form a back pasted seal part, and forming a bottom seal part and a top seal part. The packaging bag has: an opening notch to be a start of opening, which is provided at a predetermined part of the back pasted seal part; and two opening guide lines which are arranged substantially symmetrically across a center line of the packaging material facing the back pasted seal part, and which guide tearing of the packaging mate
