Magnetic detection device

A magnetic detection device comprising:

• a plurality of magnetic sensors each including an excitation coil, a signal coil, and a magnetic core layer, the excitation coil and the signal coil each being formed as a conductor pattern on a board, the magnetic core layer being arranged on the board;
• a driving circuit configured to output an AC current to the excitation coil;
• and
• a detection circuit configured to acquire a detection signal from the signal coil,
• wherein a first axis sensor unit is constituted by at least two magnetic sensors out of the plurality of magnetic sensors, the at least two magnetic sensors being each arranged such that a detection direction thereof is aligned with a first axial direction,
• wherein a second axis sensor unit is constituted by at least one magnetic sensor out of the plurality of magnetic sensors, the at least one magnetic sensor being arranged such that a detection direction thereof is aligned with a second axial direction intersecting with the first axial direction,
• wherein the first axis sensor unit and the second axis sensor unit are formed on a first board which is the board common to the first axis sensor unit and the second axis sensor unit,
• wherein a third axis sensor unit is further constituted by at least one magnetic sensor out of the plurality of magnetic sensors, and the at least one magnetic sensor constituting the third axis sensor unit is arranged such that a detection direction thereof is aligned with a third axial direction intersecting with a plane formed by the first axial direction and the second axial direction, and
• wherein the third axis sensor unit is formed on a second board separate from the first board.