A position detection system includes: an object to be detected having a magnetic field generator to generate a position detecting magnetic field, and configured to be introduced into a subject； detection coils, each being configured to detect the position detecting magnetic field to output a detection signal； and a processor including hardware. The processor is configured to: correct measured values of detection signals output from the detection coils using a magnetic field generated by applying the position detecting magnetic field to a metal plate, the metal plate being disposed on a side opposite to an area to be detected of the object to be detected relative to the detection coils； and calculate at least one of a position and a direction of the object to be detected using the corrected measured values of the detection signals.
