An input device 34, wherein 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 {HEAD ~ the curved side surface} of {TAIL ~ the step portion} 
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An input device 34 , wherein 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 { HEAD ~ the curved side surface } of { TAIL ~ the step portion }
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