Patent ID: 8276455

Claim:
A pressure sensor comprising: a sensing element that has an exposed lateral end surface including a pressure detection surface, and that detects pressure of air contacting the pressure detection surface; a housing that houses therein the sensing element, the housing having an opening which opens toward an outside of the housing, the outside being a pressure sensed space; and an introduction passage that is formed in the housing, the introduction passage causing the lateral end surface of the sensing element to communicate with the opening; wherein the introduction passage has a first passage portion which contains therein the lateral end surface of the sensing element and extends directly downward at least from the lateral end surface of the sensing element; the opening is located at or lower than a lower end of the first passage portion; the housing is provided with a water restriction plate which is disposed in the first passage portion so that the water restriction plate extends across a region defined by all lines interconnecting the lateral end surface of the sensing element and the opening; and the water restriction plate is located lower than the sensing element and projects from a portion of the housing toward the sensing element, wherein the portion defines the first passage portion so as to cover the sensing element.