Disclosed is a semiconductor device having a reduced size, increased accuracy, and flattened element isolation regions with an decreased size. In order that an oxide semiconductor layer through which carriers flow is not in contact with a gate insulating film, a buried channel structure in which the oxide semiconductor layer through which carriers flow is separated from the gate insulating film is employed. The fitting portion is for insertion into the battery holding space of any one of a plurality of cordless power tools. The apparatus has the processing which stops a playback and the processing which updates the playback start position pointer 53 in a playback stop position. Preferably the weight of the web is greater than fifteen pounds per thousand square feet. A rotary member is coupled to the base member so as to be rotatable about a first axis extending vertical to the slanted surface.