The battery pack-mounting section (16) of an electric tool (10) is provided on the lower end of a grip section (15) of the electric tool (10). The lower surface (16a) of the battery pack-mounting section (16) that is covered by a battery pack (12) comprises an open window (16b). Said open window (16b) has a position and a shape that correspond to a bulging section (41a) of a control circuit (40).
