To provide a key input device capable of changing characters such as characters and symbols displayed on keys as necessary and to provide electronic equipment with the key input device.

Only one kind of characters such as characters and symbols to be displayed on keys are displayed in magnification according to a key input mode or the like. In addition, projection/recession makes it possible to easily discriminate those characters with a sense of touch. Also, the characters such as the characters or symbols to be displayed on those keys are changed as necessary according to a key input mode so that the performance of electronic equipment can be sufficiently improved.