PURPOSE:To reduce the fatigue due to operation of a keyboard by arranging character keys rationally in the relation of fingers so as to improve the input speed of a sentence comprising KANA and decrease input mistake. CONSTITUTION:The keyboard where the input speed of a sentence cimprising KANA is improved and the fatigue of the operation is reduced is attained by arranging the character keys rationally in the relation of fingers. Twenty-two keys are arranged, which input Kana, sentence codes, numerals and basic functions by depressing one key respectively by left and right hand fingers shared for the keys. Moreover, the arrangement of a bar form key for thums inputting one of the basic functions at the lower part of the said keys is one of features. In depressing left and right character keys A and auxiliary keys B, it is not necessarily to depress them sequantially in the order of right to left, and even if the left and right keys are depressed at the same time or depressed in the order of left to right, the result is the same.
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