| 摘要 |
PROBLEM TO BE SOLVED: To provide a keyboard with which operation can be performed comfortably and also which reduces the fatigue of fingers and arms because of the operation. SOLUTION: In the keyboard device 10 including plural operation keys 12 arranged so that head parts thereof can respectively project on the top surface of a case 11 and a control circuit generating a control signal on the basis of a signal from each operation key, a left key group 12a and a right key group 12b among the operation keys are arranged in an almost reverse V shape so as to respectively open outwards toward this side from the center, the left and right key groups are also curved projectingly so that the center can be higher upward with regard to a back and forth direction respectively, and they are also arranged while gently sloping from the center down to the outside. The keyboard device 10 is constructed so that the palms to fingers of both the hands of an operator can be located along the operation surface formed by each operation key in an operation mode.
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