Patent ID: 8359923

Claim:
A physical quantity sensor comprising a sensor portion; a casing having an inner wall that defines an inner space for holding the sensor portion, the inner wall spaced from the sensor portion to form a clearance therebetween; a vibration isolator located in the clearance to join the sensor portion to the casing, the vibration isolator configured to reduce a relative vibration between the sensor portion and the casing; and a lead frame configured to electrically connect an inside and an outside of the casing, wherein the sensor portion includes a capacitive sensor chip having a movable electrode and a fixed electrode, the movable electrode is configured to be displaced in a direction of the clearance between the sensor portion and the casing, and the fixed electrode is located to face the movable electrode, the sensor portion further includes a package with an entrance, a lid for covering the entrance of the package, the sensor chip is held in the package and located on an inner bottom surface of the package, and the vibration isolator is in contact with an outer side surface of the package and is not in contact with an outer bottom surface of the package.