To provide a keyboard in which the speed and accuracy of a key operation can be improved.

A keyboard 31 is provided with a keyboard face 311 and at least 10 digital keys 32 arranged on the keyboard face 311, and each digital key 32 indicates digits from '0' to '9'. In this case, a straight line connecting the digital key indicating the digit '3' with the one indicating the digit '9' substantially crosses the center of the keyboard face 311, and the digital key indicating the digit '6' is arranged so that a distance from the digital key indicating the digit '3' can be made equal to a distance from the digital key indicating the digit '9'.