DUST COLLECTING BAG FOR VACUUM CLEANER

PROBLEM TO BE SOLVED: To keep the dust removing effect by a dust collecting bag for a long period of time, and efficiently use the dust collecting bag by a method wherein for the dust collecting bag for a vacuum cleaner, wherein the bag main body is constituted of an external filter layer and an internal filter layer, the internal filter layer is constituted in such a manner that the bulk density is a specified value or lower, and the thickness is a specified dimension or higher. SOLUTION: This dust collecting bag 1 for a vacuum cleaner is constituted of a bag main body 2, and a mouth paper 3 to fix the dust collecting bag 1 in an electric vacuum cleaner. Then, the mouth paper 3 is fixed to the bag main body 2 under a state wherein a dust-containing air suction port 4 which is provided on the mouth paper 3 is superposed on an opening 5 which is provided on the bag main body 2. Also, the bag main body 2 has a double layer structure of an internal filter layer and an external filter layer. That is, the internal filter layer and the external filter layer are made, e.g. into separate sheets of filter papers, and after a double layer structure is formed by affixing these sheets with an adhesive or the like, the bag main body 2 is constituted by folding the double layer structure into a bag form in such a manner that the internal filter layer may become inside. Then, the internal filter layer is constituted in such a manner that the bulk density is 0.2 g/cm or lower, and the thickness is 0.08 mm or higher.