INPUT DEVICE

PROBLEM TO BE SOLVED: To provide an input device that can detect key input operation even if an amount of change in capacitance detected by a touch sensor is reduced after the sensitivity of the touch sensor changed.SOLUTION: An input device 1 of an electronic apparatus 20 comprises: an input operation unit having a plurality of keys including a first specific key and receiving key input operation; a detector 2 having a plurality of capacitance touch sensors 40 detecting the key input operation; and a control circuit unit 3 outputting output information related to a detected key to the electronic apparatus 20. The control circuit unit 3 has a sensitivity level change unit 8 that changes a sensitivity level of the touch sensor 40 by key input operation related to a change in sensitivity level of the touch sensor 40. The sensitivity level change unit 8 restricts the sensitivity level of the touch sensor 40 detecting key input operation of the first specific key to be set to the lowest settable level, and increases the sensitivity level of the other touch sensors 40 by key input operation including the first specific key.