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