In a self-standing packing bag with a spout of the present invention, a bottom section is formed by a bottom member that is half folded at a fold line and is attached to an inside of a lower portion of the trunk section such that the fold line faces upward, an extending direction of the fold line of the bottom section and a closing direction of an upper end of the trunk section intersect each other on a horizontal projection plane, and side end portions of two regions of the bottom member divided by the fold line are planarly bonded to an inside of the trunk section in an overlapping state.