Pressure detector and touch panel provided with pressure detector

To provide a pressure detector that makes it possible to accurately detect pressing force. This pressure detector is provided with: a first piezoelectric sheet (3a); a second piezoelectric sheet (3b) that is arranged so as to be in the vicinity of the first piezoelectric sheet (3a) or in contact with the first piezoelectric sheet (3a); and a detection electrode (4) that has the first piezoelectric sheet (3a) and the second piezoelectric sheet (3b) sandwiched therebetween. The first piezoelectric sheet (3a) and the second piezoelectric sheet (3b) are configured from materials having the same characteristics, have a thickness of 5-50 [mu]m, and are configured so that each of the potential differences that occur between the surfaces of the first piezoelectric sheet (3a) and the second piezoelectric sheet (3b) that are on a support substrate (1) side and the surfaces thereof that are on the opposite side from the support substrate (1) side satisfies the relationship that is represented by formula (1) indicated be