An electronic apparatus includes a first detection electrode group, a second detection electrode group, a third detection electrode group, a rotating member for moving among positions in which the rotating member faces the first to third detection electrode groups, a detection unit for detecting electrostatic capacitances of the first to third detection electrode groups, a determination unit for determining a rotation direction, a rotation amount, or a rotation angle of the rotating member in accordance with the electrostatic capacitances of the first to third detection electrode groups and threshold values for the first to third detection electrode groups, and an updating unit for updating a reference value of one of the first to third detection electrode groups corresponding to a selected smallest electrostatic capacitance using the selected smallest electrostatic capacitance.