To provide a method of manufacturing a packaging bag with a zipper for expanding flexibility relating to a shape or a size of the zipper by suppressing increase of the manufacturing step when enabling to sense a fitting state in closing operation.

In the method of manufacturing the packaging bag with the zipper wherein the zipper having a female mold fitting part and a male mold fitting part of fittable pair of projection parts to each other is provided at the opening part of the packaging bag, when extrusion molding a substrate and a fitting piece composing the male mold tape body, a non-fitting space 14S wherein the male mold connection part 24b is a gap to be intermittent in the stretching direction is formed by forming a cut surface CS in the male mold connection part 24b and directing from the head top of the male mold connection part 24b toward the surface corresponding to the substrate and stretching the male molding body 24.

COPYRIGHT: (C)2010,JPO&INPIT