A position detection device includes an accommodation portion, a planar coil, a first control circuit, and a first detection circuit. The accommodation portion accommodates therein an electronic pen having a position indication coil wound in an axial direction of the electronic pen. The planar coil is disposed adjacent to the accommodation portion at a position at which a center axis direction of the planar coil crosses the axial direction of the electronic pen while the electronic pen is accommodated in the accommodation portion. The first control circuit performs control such that supply of a signal to the planar coil and reception of a signal through the planar coil by electromagnetic induction are performed alternately. The first detection circuit detects a state regarding accommodation of the electronic pen in the accommodation portion in accordance with a presence or an absence of a signal received through the planar coil.