Position detection device

A position detection device comprising:

• a magnetic field generator configured to generate a magnetic field to be detected having a first direction at a reference position within a first plane;
• and
• a magnetic sensor configured to detect the magnetic field to be detected and generate a detection value corresponding to a relative position of the magnetic field generator with respect to the magnetic sensor, the magnetic sensor including:
• a magnetoresistive element including a first magnetic layer having first magnetization that can change in direction within a second plane corresponding to the magnetoresistive element, the second plane being oblique to the first plane, the magnetic field to be detected received by the magnetoresistive element including an in-plane component parallel to the second plane, the in-plane component having a second direction that changes with a change in the first direction, the first magnetic layer being configured such that the direction of the first magnetization changes with a change in the second direction, and the detection value depending on the direction of the first magnetization, wherein
• the magnetic field generator and the magnetic sensor are configured such that as the relative position of the magnetic field generator with respect to the magnetic sensor changes, the first direction changes within a predetermined variable range in the first plane,
• the magnetic sensor further includes a substrate that supports the magnetoresistive element,
• the substrate includes a main surface, and
• the second plane is oblique to each of the first plane and the main surface.