PROXIMITY DETECTOR HAVING OBLIQUE DETECTION ELECTRODE GROUP

A proximity detecting device comprises: a first detection electrode group having a plurality of detection electrodes; a second detection electrode group having a plurality of detection electrodes that orthogonally crosses the first detection electrode group; an obliquely crossing detection electrode group having a plurality of detection electrodes that obliquely crosses each of the first detection electrode group and the second detection electrode group; detecting means that is capable of detecting electrostatic capacitances according to a proximity state of a detection-target object for each of the first detection electrode group, the second detection electrode group, and the obliquely crossing detection electrode group; and controlling means that performs execution through switching between a first detection mode in which the proximity state of the detection-target object is determined based on the electrostatic capacitances of each of the first detection electrode group and the second detection electrode group and a second detection mode in which a proximity state of each of the plurality of detection-target objects is determined based on the electrostatic capacitances of each of the first detection electrode group, the second detection electrode group, and the obliquely crossing detection electrode group.