Magnetic sensor with an elongated element for reducing hysteresis

A magnetic sensor comprising an element portion that is elongate, that exhibits magnetoresistive effect and that has a magnetically sensitive axis in a direction of a short axis thereof, wherein

• the element portion is non-oval and can be arranged in an imaginary ellipse,
• the imaginary ellipse has a major axis that connects both ends of the element portion with regard to a direction of a long axis thereof to each other and a minor axis that connects both ends of the element portion with regard to a direction of the short axis thereof to each other, as viewed in a direction that is perpendicular both to the short axis and to the long axis of the element portion,
• a width of the element portion with regard to the direction of the short axis thereof gradually decreases from a middle position of the element portion with regard to the direction of the long axis thereof toward both ends of the element portion with regard to the direction of the long axis thereof as a distance from the middle position increases, and
• a rate of a change in the width of the element portion in the direction of the long axis gradually increases from the middle position toward both ends of the element portion with regard to the direction of the long axis thereof as the distance from the middle position increases.