A sensor apparatus includes: a sensor panel that includes an input operation surface and is configured to detect positional coordinates of a detection object that comes into contact with the input operation surface; a casing; and a pressure-sensitive sensor that includes a first electrode fixed on the sensor panel side, a second electrode fixed on the casing side, and an elastic member that is provided between the sensor panel and the casing and elastically supports the sensor panel with respect to the casing, includes, between the first electrode and the second electrode, a first area formed with a first capacitance and a second area formed with a second capacitance larger than the first capacitance, and is configured to detect a pressing force input to the input operation surface as a change in a capacitance between the first electrode and the second electrode.