Magnetic balance type current sensor

A The magnetic balance type current sensor comprising:

• a magnetic sensor having an output varying due to an induced magnetic field applied from a current wire through which a current to be measured flows;
• a magnetic field attenuation member configured to attenuate the induced magnetic field applied to the magnetic sensor;
• and
• a feedback coil configured to generate a cancel magnetic field for cancelling the induced magnetic field based on the output of the magnetic sensor, a detection current corresponding to the current to be measured flowing through the feedback coil in flow when it a balanced state where the cancel magnetic field and the induced magnetic field cancel each other,
• wherein the feedback coil is provided such that a direction of the cancel magnetic field applied on the magnetic field attenuation member is opposite to a direction of the induced magnetic field applied on the magnetic field attenuation member,
• and wherein the magnetic sensor, the magnetic field attenuation member, and the feedback coil are laminated on a substrate in such an order that the magnetic field attenuation member is disposed between the feedback coil and the magnetic sensor.