To provide a detector capable of detecting a slide direction of external pressure applied to a measurement surface with high accuracy.

The detector comprises: a first substrate 10 on which a plurality of pressure sensors 12 are arranged around a base point P; and a second substrate 20 formed with an elastic body projection 22 whose tip part is provided with a plurality of auxiliary projections 22b corresponding to the plurality of pressure sensors 12 and that is elastically deformed with the plurality of auxiliary projections 22b respectively abutting on the corresponding pressure sensors 12 due to external pressure.