Patent ID: 7628078

Claim:
A pressure sensor comprising: a first tubular member including at one end portion thereof a sensing section outputting an electrical signal indicative of a pressure applied thereto, and an opening section formed at the other end portion thereof; a second tubular member including an opening section formed at one end portion thereof, and a diaphragm located at one end portion thereof; a housing having an opening at one end portion thereof; and a pressure transmission member operating to transmit a pressure applied thereto to said sensing section; said first and second tubular members being integrally connected to each other at said opening section of said first tubular member and said opening section of said second tubular member, said pressure transmission member being housed in a hollow space of said first and second tubular members integrally connected to each other such that one end portion thereof is located at a side of said sensing section and the other end portion thereof is located at a side of said diaphragm, said first and second tubular members integrally connected to each other being inserted into said opening section of said housing to be supported by said housing such that said sensing section is located inside said housing and said diaphragm projects from said housing, wherein said first and second tubular members integrally connected to each other is inserted into said opening section of said housing so that a fixing portion between said first and from a side of said sensing section, so that a fixing portion between said second tubular members is located inside said housing, an outer periphery of said second tubular member being pressure-insertion fixed to an inner periphery of said opening section of said housing, wherein a diameter of said hollow space at a position at which a midway portion of said pressure transmission member is located is smaller than diameters of said hollow space at positions at which end portions of said pressure transmission member are located respectively, and wherein a midway portion of said hollow space facing said midway portion of said pressure transmission member is formed by said second tubular member, and a wall thickness of said second tubular member is larger than a wall thickness of said first tubular member.