Pressure sensor and method of manufacturing pressure sensor

A pressure sensor comprising:

• a substrate that has a first main surface and a second main surface facing the first main surface and has a thickness in a first direction where the first main surface and the second main surface face each other;
• a first chamber that is recessed from the first main surface in the first direction with respect to the substrate;
• at least one second chamber that is recessed from the first main surface in the first direction with respect to the substrate and is adjacent to the first chamber at an interval in a second direction orthogonal to the first direction;
• a fluid passage that is recessed from the first main surface in the first direction with respect to the substrate and causes the first chamber to be in fluid communication with an outside;
• a closing layer that is laminated on the first main surface of the substrate and closes openings of at least the first chamber and the at least one second chamber on the first main surface;
• and
• at least one membrane that is partitioned by the first chamber and the at least one second chamber in the substrate between the first chamber and the at least one second chamber in the second direction and extends in a plane parallel to the first direction and a third direction orthogonal to the first direction and the second direction.