An input device includes a selection circuit to which a plurality of electrodes disposed in a capacitive touch panel are connected, a line connected to the selection circuit and having a same internal resistance as that between the plurality of electrodes and the selection circuit, an A/D conversion part connected to the selection circuit so as to measure a voltage of the electrodes or a measurement value when the line is connected thereto, wherein the electrodes and the line are each connected selectively to the A/D conversion part by the selection circuit, and a control part configured to control the selection circuit so as to allow the A/D conversion part to measure a voltage of one of the electrodes and the measurement value, and to calculate an electrostatic capacitance of one of the electrodes based on the voltage of one of the electrodes and the measurement value.