A dust collecting device, which is removably attachable to a portable power tool and carriable together with the portable power tool, wherein the dust collecting device collects dust generated when a predetermined operation is performed on a workpiece by driving a tool bit coupled to the power tool, comprising: a dust suction region that is adapted to suck dust generated during operation in response to the operation of the tool bit, a dust transfer region that is adapted to transfer the dust sucked in the dust suction region, and a dust storage region that is adapted to communicate with the dust transfer region and to store the dust, a dust storage region mounting part to which the dust storage region is removably attached, and a grounding member through which static charge on the dust is dissipated, wherein the grounding member is provided to dissipate static charge on the dust stored in the dust storage region, and the grounding member comprises an electrically-conductive material and the static charge on the dust is dissipated through the electrically-conductive material, characterized in that the electrically-conductive material is disposed to face the dust storage region and electrically connected to an electrically-conductive region of the dust collecting device or an electrically-conductive region of the power tool to which the dust collecting device is attached, so that the static charge on the dust stored in the dust storage region is dissipated to the electrically-conductive region through the electrically-conductive material, and in that an intervening member is provided on the dust storage region mounting part and connects the electrically-conductive region and the electrically-conductive material, and when the dust storage region is attached to the dust storage region mounting part, the intervening member serves to electrically connect the electrically-conductive region and the electrically-conductive material and also to cushion a contact region between the dust storage region and the dust storage region mounting part. a dust suction region that is adapted to suck dust generated during operation in response to the operation of the tool bit, a dust transfer region that is adapted to transfer the dust sucked in the dust suction region, and a dust storage region that is adapted to communicate with the dust transfer region and to store the dust, a dust storage region mounting part to which the dust storage region is removably attached, and a grounding member through which static charge on the dust is dissipated, wherein the grounding member is provided to dissipate static charge on the dust stored in the dust storage region, and the grounding member comprises an electrically-conductive material and the static charge on the dust is dissipated through the electrically-conductive material, characterized in that the electrically-conductive material is disposed to face the dust storage region and electrically connected to an electrically-conductive region of the dust collecting device or an electrically-conductive region of the power tool to which the dust collecting device is attached, so that the static charge on the dust stored in the dust storage region is dissipated to the electrically-conductive region through the electrically-conductive material, and in that an intervening member is provided on the dust storage region mounting part and connects the electrically-conductive region and the electrically-conductive material, and when the dust storage region is attached to the dust storage region mounting part, the intervening member serves to electrically connect the electrically-conductive region and the electrically-conductive material and also to cushion a contact region between the dust storage region and the dust storage region mounting part.