An input device includes an operation panel member having a touch-sensitive surface and configured to detect coordinates of a touched position, a first sensor, a second sensor, and a third sensor each disposed on a reference plane spaced from the operation panel member and configured to detect respective distances to the operation panel member, and a signal processing unit configured to process signals, wherein the operation panel member inclines relative to the reference plane in response to load applied to the touched position, and wherein the signal processing unit is configured to calculate a displacement of the operation panel member occurring upon a touch operation at the touched position based on coordinates of the touched position detected by the operation panel member and the respective distances detected by the first sensor, the second sensor, and the third sensor.