Magnetic detection device

A magnetic detection device comprising:

• a magnetoimpedance sensor element comprising a magnetic sensitive body that is configured to cause a magnetization change corresponding to a strength of a magnetic field when an excitation current is supplied, and a detection coil that is wound around the magnetic sensitive body and is configured to output an induced voltage caused by the magnetization change of the magnetic sensitive body;
• a main operational amplifier comprising an inverting input terminal and a non-inverting input terminal, one of which is connected to a first end of the detection coil, and an other of which is connected to a second end of the detection coil opposite to the first end;
• a first feedback circuit that is connected between an output terminal of the main operational amplifier and the first end of the detection coil and is configured to generate a first feedback voltage for causing a feedback current in the detection coil;
• and
• a second feedback circuit that is connected between the output terminal of the main operational amplifier and the second end of the detection coil and is configured to generate a second feedback voltage with a polarity that inverts a polarity of the first feedback voltage with respect to a predetermined reference voltage as a baseline for causing the feedback current in the detection coil.