Magnetic sensor and magnetic detection system

A magnetic sensor comprising:

• a first half-bridge circuit including a first magnetoresistive effect element and a second magnetoresistive effect element that are half-bridge connected to each other and a first output terminal configured to deliver a first output signal from a node of connection between the first magnetoresistive effect element and the second magnetoresistive effect element;
• a second half-bridge circuit including a third magnetoresistive effect element and a fourth magnetoresistive effect element that are half-bridge connected to each other and a second output terminal configured to deliver a second output signal from a node of connection between the third magnetoresistive effect element and the fourth magnetoresistive effect element;
• and
• a holding member that holds the first half-bridge circuit and the second half-bridge circuit,
• the first magnetoresistive effect element being configured to detect a magnetic field aligned with an X-axis,
• the second magnetoresistive effect element being configured to detect a magnetic field aligned with a Y-axis perpendicular to the X-axis,
• the third magnetoresistive effect element being configured to detect a magnetic field aligned with a first axis, the first axis being coplanar with the X-axis and the Y-axis and different from any one of the X-axis or the Y-axis,
• the fourth magnetoresistive effect element being configured to detect a magnetic field aligned with a second axis, the second axis being coplanar with the X-axis and the Y-axis and perpendicular to the first axis.