To obtain a highly reliable pressure sensor by making an atmosphere introduction hole through the body with the outer open end thereof being located on the opposite side to a mounting board with respect to the body thereby preventing a foreign matter from intruding into the pressure sensor when it is mounted on the mounting board.
A pressure introduction tube 11 has a flow-in hole 11b communicating between the inside 1a and outside and an object for pressure measurement, i.e., a fluid, flows into the flow-in hole 11b. Since the outer open end 12a of atmosphere introduction hole 12b made through the body 1 is located on the opposite side to a mounting board 8, a pressure sensor chip 2 is not susceptible to corrosion due to gas intruding into the body 1 through introduction hole 12b on the contrary to a conventional structure where the introduction hole 12b is made through a cover 6. Consequently, the service life of chip 2 is prolonged and the introduction hole 12b is not choked with a foreign matter.
KAJI NORIKIMI
YAJIMA TAKASHI
