Patent ID: 8015880

Claim:
A pressure sensor which is provided at a supply and discharge pipe of a reaction gas which is supplied to or discharged from a fuel cell and which measures a pressure of the reaction gas in the pipe, the pressure sensor comprising: an engagement section which is threaded and which engages a pipe wall of the pipe; a pressure-detecting section which faces a reaction gas flow path of the pipe and which detects a pressure in the pipe through displacement; a displacement sensor which is provided in the pressure-detecting section and which measures the displacement of the pressure-detecting section; and a buffer section which connects the engagement section and the pressure-detecting section with a buffer layer which is in communication with the reaction gas flow path of the pipe therebetween, and which absorbs an abnormal displacement occurring in the pressure-detecting section through deformation in response to a stress which is applied due to a torque of the screw when the pressure sensor is engaged to the pipe.