A magnetic inspection device comprising: a magnetic sensor device including: a case disposed facing an object that is to be detected; a plurality of magnetic sensing portions accommodated inside the case; a magnet configured to generate a bias magnetic field, the bias magnetic field is applied to the plurality of magnetic sensing portions; and a magnetic generator disposed inside the case, between the plurality of magnetic sensing portions and the object that is to be detected, wherein the magnetic generator is a non-magnetic conductive member, and the conductive member is disposed along a direction in which the magnetic sensing portions are arranged in a line; the magnetic inspection device further comprising: an inspection unit configured to inspect the object that is to be detected, using signals output from the plurality of magnetic sensing portions; a current supply unit (21, R) configured to supply a current to the magnetic generator when the object is not present, thereby causing the magnetic generator to generate a magnetic field that acts on the plurality of magnetic sensing portions; and a correcting unit configured to cause a value of each signal output by the plurality of magnetic sensing portions to match a predetermined target value, according to the magnetic field generated by the magnetic generator. a case disposed facing an object that is to be detected; a plurality of magnetic sensing portions accommodated inside the case; a magnet configured to generate a bias magnetic field, the bias magnetic field is applied to the plurality of magnetic sensing portions; and a magnetic generator disposed inside the case, between the plurality of magnetic sensing portions and the object that is to be detected, wherein the magnetic generator is a non-magnetic conductive member, and the conductive member is disposed along a direction in which the magnetic sensing portions are arranged in a line; the magnetic inspection device further comprising: an inspection unit configured to inspect the object that is to be detected, using signals output from the plurality of magnetic sensing portions; a current supply unit (21, R) configured to supply a current to the magnetic generator when the object is not present, thereby causing the magnetic generator to generate a magnetic field that acts on the plurality of magnetic sensing portions; and a correcting unit configured to cause a value of each signal output by the plurality of magnetic sensing portions to match a predetermined target value, according to the magnetic field generated by the magnetic generator. an inspection unit configured to inspect the object that is to be detected, using signals output from the plurality of magnetic sensing portions; a current supply unit (21, R) configured to supply a current to the magnetic generator when the object is not present, thereby causing the magnetic generator to generate a magnetic field that acts on the plurality of magnetic sensing portions; and a correcting unit configured to cause a value of each signal output by the plurality of magnetic sensing portions to match a predetermined target value, according to the magnetic field generated by the magnetic generator.