Abstract: The present invention provides a pressure detection unit and a pressure sensor using the same that have a high degree of airtightness and that are capable of suppressing bonding defects even when the base is made of ceramics. In the pressure detection unit, a linear expansion coefficient of ceramic that forms the ceramic base 110 is set to ?1 (10?6/K) and a linear expansion coefficient of metal that forms the metal ring member 140 is set to ?2 (10?6/K), a relationship of 0.7×?2??1 exists between the linear expansion coefficients ?1 and ?2, and the metal ring member 140 is formed of a metal such as SUS420J2, SUS410, or SUS444, for example, which does not precipitate aluminum oxide on a brazing surface with a projecting portion.