A resonant pressure sensor includes: a housing; a housing-fixed portion that is fixed to the housing; a substrate that comprises: a substrate-fixed portion that is fixed to the housing-fixed portion; and a substrate-separated portion that is separated from the housing-fixed portion in a first direction and extends from the substrate-fixed portion; a first resonator that is disposed in the substrate-separated portion and that detects a change of a resonance frequency based on a strain in the substrate caused by static pressure applied by a pressure-receiving fluid; a first electrode that extends along a second direction perpendicular to the first direction and that outputs an excitation signal to the first resonator to excite the first resonator; and a second electrode that extends along the second direction and from which the first resonator outputs a signal having the resonance frequency.