Physical quantity sensor

A physical quantity sensor comprising:

• an anchor portion immovably supported;
• a movable portion displaceable in a height direction;
• a supporting portion rotatably connected to the anchor portion and to the movable portion;
• and
• a detection portion for detecting displacement of the movable portion,
• wherein the supporting portion includes a leg portion for restricting the displacement of the movable portion by moving in a direction opposite to a displacement direction of the movable portion when the supporting portion rotates and the movable portion is displaced in the height direction,
• wherein the supporting portion includes a first connection arm connecting the anchor portion and the movable portion to each other, the leg portion extends from the anchor portion in a direction opposite to the first connection arm, and when the supporting portion rotates, the first connection arm and the leg portion are displaced in opposite directions around a fulcrum joint between the anchor portion and the first connection arm, and
• wherein a plurality of the supporting portions each including the leg portion is provided, the first connection arm of one of the supporting portions and the first connection arm of another of the supporting portions extend in opposite directions with the anchor portion therebetween, and the leg portion of the one of the supporting portions and the leg portion of the another of the supporting portions extend in opposite directions with the anchor portion therebetween.