PROBLEM TO BE SOLVED: To provide a dust collection bag in which the opening and closing operation of an extraction opening part can be surely and easily performed and which is inexpensive. ;SOLUTION: This is a dust collection bag 1 which has a mounting opening part 1a mounted on a discharge pipe 7 and an extraction opening part 1b opened and closed by a string 8 at both ends, and the extraction opening part 1b is closed by pulling dot the string 8 in the state of being suspended from the downward discharge pipe 7, and the lower end of the string 8 is fixed to a fixing body 11 in the state of pulling the string 8. A coil spring 12 and a hook 13 are connected to the lower end of the string 8, and the hook 13 is detachably locked to the fixing body 11 by utilizing the elastic expansion and contraction of the coil spring 12, and the dust collection bag 1 is held in the state of being pulled don to keep the extraction opening part 1b closed. When the hook 13 is removed from the fixing body 11, the string 8 becomes loose, so that the extraction opening part 1b is opened and the dust is removed.;COPYRIGHT: (C)1997,JPO
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