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