a substrate including a flat surface;

a first projection and a second projection each provided on the flat surface and each including a first inclined surface and a second inclined surface, the first inclined surface being inclined with respect to the flat surface, the second inclined surface being inclined with respect to both the flat surface and the first inclined surface;

a first magnetoresistive effect film provided on the first inclined surface;

a second magnetoresistive effect film provided on the second inclined surface;

a first wiring line coupling the first magnetoresistive effect film provided on the first inclined surface of the first projection and the first magnetoresistive effect film provided on the first inclined surface of the second projection to each other;

a second wiring line coupling the second magnetoresistive effect film provided on the second inclined surface of the first projection and the second magnetoresistive effect film provided on the second inclined surface of the second projection to each other; and

one or more patterns, wherein

the first projection and the second projection are adjacent to each other in a first direction, with the first inclined surface of the first projection and the second inclined surface of the second projection being opposed to each other in the first direction, and

the one or more patterns are provided on the first inclined surface of the first projection, the second inclined surface of the second projection, or both, of the first inclined surface of the first projection and the second inclined surface of the second projection that are opposed to each other.