Physical quantity sensor

A physical quantity sensor comprising:

• a substrate;
• an anchor portion formed on the same side as a principal surface of the substrate and fixed to the substrate;
• a surrounding portion formed on the same side as the principal surface of the substrate and surrounding the anchor portion;
• a detecting element configured to detect a physical quantity as a target of detection;
• a moving portion provided with at least a part of the detecting element, formed on the same side as the principal surface of the substrate, and connected to the surrounding portion;
• a beam portion formed on the same side as the principal surface of the substrate and connecting the anchor portion and the surrounding portion together;
• and
• a cover facing the substrate to cover the anchor portion, the surrounding portion, the moving portion, and the beam portion, wherein
• the anchor portion is fixed to the cover, and
• the surrounding portion is fixed to the cover.