To provide a dust collector grasping the quantity of dust collected in order to solve the problem of the conventional polishing power tool with a dust sucker wherein since fibrous material such as cloth or paper is used, it is difficult to grasp the quantity of dust collected, and when powder dust is accumulated too much in the dust collector, the dust collecting capability is remarkably lowered, so that the powder dust flows backward to the body of the power tool and the powder dust is accumulated in the parts in the power tool, resulting in shortening the life.

In this hand-held power tool for polishing, including a driver for polishing or grinding, a dust sucker for sucking powder dust in polishing, and a dust collector for collecting the sucked powder dust, the dust collector is provided with a window with a scale for confirming the quantity of dust sucked, and the window is formed of a belt 5 to 15 mm wide made of transparent resin such as polyamide (PA), polypropylene (PP) and polyethylene (PE).