Patent ID: 8915309

Claim:
A dust collecting device comprising: a casing that forms a dust collecting route, through which outside air sucked from a suction port flows, and can be attached to an electric tool; and a dust box that is removably joined to a joint portion provided on the casing, and is provided therein with a vent channel equipped with a filter and constituting part of the dust collecting route, wherein the dust box is formed of a box body and a lid body that is joined by a hinge to the box body and can open and close an opening of the box body; the filter is attached to the lid body; and the dust box is joined to the joint portion by forming in one of a pair of lateral faces of the box body a recessed groove in which a shaft protrusion formed on the joint portion is fitted, forming on the other lateral face of the box body an engagement strip that elastically engages a permeable hole formed through the joint portion, fitting the shaft protrusion into the recessed groove, and rotating the dust box around the shaft protrusion to engage the engagement strip with the permeable hole.