Abstract: A movement amount calculation unit for integrating, over a movement amount collection time period, a movement amount of a coil unit when the coil unit moves, the movement amount being calculated on the basis of an electromotive force occurring in the coil unit as the coil unit moves, to thereby calculate a movement amount for determination of the coil unit, and a pushing determination unit for determining the existence or nonexistence of a pushing operation by using the movement amount for determination calculated by the movement amount calculation unit are included.