Position detection device

A position detection apparatus that detects a position indicated on a position detection sensor by an electronic pen including a resonant circuit that changes a resonance frequency according to a pen pressure applied, and also detects a pen pressure applied to the electronic pen, by performing interaction of a signal through electromagnetic induction coupling with the electronic pen, the position detection apparatus comprising:

• a signal transmission circuit that outputs a signal for the interaction;
• a receiving circuit that receives, via the position detection sensor, a feedback signal from the resonant circuit of the electronic pen for a signal transmitted from the signal transmission circuit via the position detection sensor;
• and
• a control circuit that supplies a control signal for changing a frequency of the signal to the signal transmission circuit, wherein
• the control circuit switches, by the control signal, a frequency of the signal from the signal transmission circuit from a first frequency that is equal to the resonance frequency of the resonant circuit when a pen pressure is not applied to the electronic pen to a second frequency that is different from the first frequency in a direction in which the resonance frequency changes according to the pen pressure, when a signal level of the feedback signal received by the receiving circuit is detected to be equal to or higher than a predetermined threshold.