Glow plug with pressure sensor

A glow plug with a pressure sensor comprising:

• a cylindrical housing having an axial hole extending in an axial line direction;
• a ceramic heater that is inserted into the axial hole so that at least a front end part of the ceramic heater protrudes from a front end of the housing, said ceramic heater being relatively displaceable with respect to the housing along the axial line direction, and having at least an outer surface made of ceramic;
• a pressure sensor fixed directly or indirectly to the housing and configured to output a signal based on a relative displacement of the ceramic heater;
• a fixed member fixed to the ceramic heater while the ceramic heater is arranged to an inner circumference of the fixed member;
• and
• a welded member welded to an outer circumference of the fixed member, wherein
• an inner circumferential surface of a portion of the fixed member, to which at least the welded member is welded, is spaced apart from the outer surface of the ceramic heater,
• the ceramic heater has a base member made of insulating ceramic and a heating element provided inside the base member, an outer surface of the base member contacting an inner surface of the fixed member, and
• the heating element has an electrode extraction part exposed in an outer surface of the base member.