A pressure detection sensor having a piezoelectric film with a first region and a second region located outside the first region, the piezoelectric film being deformable by a pressing operation, a first electrode pair disposed on a first main surface and a second main surface in the first region of the piezoelectric film, and a second electrode pair formed on a first main surface and a second main surface in the second region of the piezoelectric film. When the piezoelectric film receives a pressing operation, the first electrode pair outputs a voltage having a polarity different from that of the second electrode pair.