A magnetic material sensing device which senses a magnetic material by
detecting a signal which the magnetic material emits when an alternating
magnetic field is applied, the magnetic material sensing device includes:
an exciting coil which applies the alternating magnetic field; a
receiving coil which receives a first signal which is generated due to
the alternating magnetic field; a noise signal removing part that
removes, from the first signal, a noise signal of an object which
reflects the alternating magnetic field; and a detecting part that
detects, from the noise signal-removed signal, the signal emitted from
the magnetic material.