A touch panel device includes a touch panel on which capacitance in a conductor contact region of an operation surface changes, at least one pressure sensor to output a pressure detection signal according to pressing force applied to the operation surface and a pressing position, and a controller to calculate first coordinates on the operation surface based on the capacitance and calculates second coordinates on the operation surface based on a pressure value indicated by the pressure detection signal. The controller outputs an operation signal based on the first coordinates when a first region as a region where the capacitance is higher than predetermined threshold capacitance is detected, size of the first region is less than or equal to a predetermined certain value, and the pressing force is greater than predetermined threshold pressing force.