INPUT DEVICE AND METHOD OF OPERATING INPUT DEVICE

An input device includes a measurement unit configured to measure a physical quantity according to an operation including at least one of touch of an operating object and proximity of the operating object, a determination unit configured to determine an operation state including an operation existence state and an operation nonexistence state, on the basis of at least a base value and the physical quantity, and a base value updating unit configured to update the base value using the physical quantity when a magnitude of a change in the physical quantity per predetermined time falls within a predetermined range, during an operation existence period in which the operation state is the operation existence state.