To provide an input device capable of simplifying operation as the input device of numbers and characters of portable equipment such as a portable telephone set or a portable terminal and promptly selecting and determining an input character.

The input device is a touch panel type keyboard and includes: a control part comprising a control circuit for displaying an array being a base for inputting a first signal on a display, and a control circuit for displaying a plurality of key arrays where character data for inputting a second signal are arranged at each key of a basic array key group on the display; and a character data control part for displaying a basic array for inputting the first signal and a plurality of developed arrays allocated to the respective keys when the first signal is inputted and turning the first signal and the second signal to input data.