Pressure sensor and method for its assembly

Pressure sensor (100) for attachment to an engine block (300), wherein the pressure sensor (100). a pressure receiving membrane (13) which receives a pressure, a detection unit (20) that outputs a signal corresponding to a level of the pressure, a pressure transfer rod (80), for detecting unit (20) transmits the pressure that is received from the pressure receiving membrane (13), and a housing (10) that accommodates the detection unit (20) and the pressure transmission rod (80), wherein the pressure transmission rod (80) within the housing (10) arranged such that the first end is located at a side of the detection unit and a second end at a side of the pressure receiving membrane, the housing (10) has a detecting unit accommodating portion that accommodates the detection unit (20) and a tube section (10c) extending from the detecting unit accommodating portion in the form of a tube, is disposed adjacent a first end of the tubular portion (10c) for detecting unit accommodating portion, and a second end of the tubular portion (10c) is arranged away from the detecting unit accommodating portion, the second end of the tubular portion (10c) has an opening (10d) the tube section (10c) of an inner pipe (11c) and an outer pipe (12c) is constructed, the inner pipe (11c) inside the outer pipe (12c) disposed on the outer tube (12c) is fixed, ...