Abstract: A vacuum type portable sander for exhausting dust emitted during the sanding, and housed within a lid-shaped shield which encloses the rotary disc. The shield has a body of hard material provided with an exhaust outlet, and at the bottom edge has a skirt member to contact the work surface during sanding. This skirt member is installed to move freely up and down along the outer periphery of the body. The main body has a resilient member in order to make the skirt member rebound onto the work surface during sanding. The skirt member is installed suspended from a hook on the upper part of the main body. The skirt member of this invention as configured above, can move up and down in response to irregular portions on the work surface and the interior of the shield therefore maintains a good seal to match variations on the work surface. The skirt member of this invention sustains damage due to wear from contact with work surfaces such as walls.