Patent ID: 7845229

Claim:
An acceleration sensor comprising: a circuit chip having a prescribed circuit built into a front surface thereof; a sensor chip bonded to the front surface of the circuit chip; and a resin package for sealing the circuit chip and the sensor chip, the sensor chip comprising: a membrane arranged to oppose to the front surface of the circuit chip and having a plurality of openings; a piezoresistor formed on a surface of the membrane opposed to the circuit chip; a support section provided on a side opposite to the circuit chip with respect to the membrane and supporting a peripheral edge portion of the membrane; a weight section provided on the side opposite to the circuit chip with respect to the membrane and integrally held on a central portion of the membrane; and a lid member provided so as to close a space between the support section and the weight section from a side opposite to the membrane, wherein a surface of the lid member facing away from the circuit chip is covered with the resin package.