Abstract: A hexagonal-cell honeycomb carrier body, made of cordierite ceramic, for use in a carrier of a catalyst of purifying exhaust gas is disclosed as including a large number of hexagonal cells surrounded with cell walls formed in a hexagonal lattice pattern and a cylindrical skin layer covering outer circumferential sidewalls of the hexagonal cells. The hexagonal-cell honeycomb carrier body has GSA (Geometric Surface Area) of 3.5 mmW or more. A hexagonal-cell honeycomb catalyst body comprises the hexagonal-cell honeycomb carrier body and a catalyst layer which covers a surface of the hexagonal-cell honeycomb carrier body.

Abstract: The pressure sensor has a housing, a sensing body mounted inside an internal space of the housing and having a cavity, one end thereof being open and other end thereof being closed, to form a pressure introducing portion therein, the closed end thereof having a thin thickness forming a diaphragm for receiving a pressure, and a semiconductor chip mounted on one surface of the closed end opposite to the diaphragm for receiving a pressure. The pressure sensor is characterized in that the sensing body is attenuated at a portion including at least the closed end thereof and has a diameter smaller than that of the remaining portion thereof, and a shoulder is provided therebetween, whereby the sensing body is fixedly connected to the internal space of said housing by abutting the shoulder thereof against a stopper portion provided in the internal space of the housing and the external surface thereof is placed in contact with the inner surface of the internal space of the housing.