BAG-SHAPED SHEET FOR FILING

PROBLEM TO BE SOLVED: To obtain a bag-shaped sheet for filing which makes the edges of papers or the like move smoothly without resistance even when they come close to a belt-shaped bonded part on the occasion of putting the papers in and out of the internal space of the sheet, and thus makes it possible to put the papers in and out smoothly. SOLUTION: The bag-shaped sheet being square and flat is formed of a thermally weldable synthetic resin film. One lateral edge of the sheet ranging from the opening 1 thereof to the seal line 2 at the bottom is formed into a belt-shaped binding margin 3 of a prescribed width by ultrasonic sealing and further filing holes 4 are so formed as to be disposed therein. In the bag-shaped sheet A for filing thus constituted, the belt-shaped binding margin 3 has a laminated structure wherein one belt-shaped thermally weldable synthetic resin film 6 having a smooth lateral side is held between two thermally weldable synthetic resin films 5a and 5b constituting the surface and the rear of the bag-shaped sheet and the films are integrated by welding so that the lateral side of the film 6 is exposed inside the bag.