Pressure sensor

A pressure sensor which detects a combustion pressure of an engine, the pressure sensor comprising:

• a contact part which is in direct or indirect contact with a casing of the engine when the pressure sensor is attached to the engine;
• and
• a pressure detection unit which detects the combustion pressure and outputs a signal corresponding to the combustion pressure,
• wherein the pressure detection unit includes a pressure detection element which detects the combustion pressure and outputs a signal, and a circuit unit which converts the signal obtained from the pressure detection element into a signal corresponding to the combustion pressure, and
• the pressure detection unit is provided at a location positioned more inside the engine than the contact part when the pressure sensor is attached to the engine;
• a pressure transmission mechanism which transmits the combustion pressure to the pressure detection element, wherein at least a part of the pressure transmission mechanism is provided at a location positioned more inside the engine than the circuit unit when the pressure sensor is attached to the engine;
• a stress absorbing part which is between the contact part and the pressure detection unit and is configured to absorb a deformation stress generated by contacting the contact part with the casing of the engine;
• wherein the pressure transmission mechanism includes an element providing part on which the pressure detection element is provided, and
• a high rigidity part which is disposed between the element providing part and the stress absorbing part and has a rigidity higher than that of the element providing part.