To improve a stopper member so as to sufficiently check a ground surface during work, so as to generate high frictional force between a stopper and a workpiece surface, and so as to dispense with strong supporting force as a factor causing inconveniently high grinding loss.

The motor-driven grip-type belt grinder is provided with a frame 19, a circulating grinding belt 25, a grinding plane 37, and a stopper member 46 attachable to a grip-type grinder 10 and defining one plane 61 by means of a plate part 52. In the plate part 52, a window-shaped opening 64 is provided above one edge 67 is the grinding belt 25 and a guide handgrip is formed.