{HEAD ~ An input device} 34, wherein the step portion has a curved side surface, the operating unit has a curved portion, and {TAIL ~ the curved portion} of the operating unit fits into the curved side surface of the step portion 
wherein
{ HEAD ~ An input device } 34 , wherein the step portion has a curved side surface , the operating unit has a curved portion , and { TAIL ~ the curved portion } of the operating unit fits into the curved side surface of the step portion
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH