The present invention provides a pressure sensor which has simple structure and can be used for measuring weight or pressure in high precision.A first dielectric sheet and a second dielectric sheet, which have symmetrically configured sections, are set between a first electrode layer and a second electrode layer in turn. When the first electrode layer is loaded up and down, the first dielectric sheet and the second dielectric sheet have the function of preventing the first electrode layer and the second electrode layer from offsetting along left and right.Therefore, the pressure sensor has a wide area which has linear variation in capaitance.
