To provide a pressure sensor of which manufacturing is easy, pressure reception sensitivity of a diaphragm is raised, and impact resistance is sufficiently assured.

The pressure sensor 10 detects a pressure from frequency change of the pressure sensitive element based on deflection of the diaphragm 40 by forming an internal space S to seal a piezoelectric vibration member 31 of the pressure sensitive element by laminating a diaphragm 40, a framed vibrator 30 which is to be a pressure sensitive element, and a substrate 20. The pressure sensor 10 includes a stopper which suppresses such deflection as exceeds breakage limit of the diaphragm 40 in the internal space S.