Patent ID: 8522613

Claim:
An acceleration sensor comprising: a weight portion; a plurality of fixed portions formed above a bottom plate around a periphery of the weight portion; a beam portion coupling the fixed portions and the weight portion, and holding the weight portion at a position separated from the bottom plate; a detection portion provided at the beam portion and detecting deformation of the beam portion; a frame portion provided so as to project out from the bottom plate and surround the fixed portions at a position separated from the fixed portions; a lid portion of plate shape that seals an opening of the frame portion; a fixed portion connection pad provided at an end portion of the fixed portion and transmitting an electrical signal from the detection portion; a first lid portion connection pad provided at the inside face of the lid portion and making contact with the fixed portion connection pad; a second lid portion connection pad provided at the inside face of the lid portion and connected by wiring to the first lid portion connection pad; a frame portion connection pad provided at the frame portion and making contact with the second lid portion connection pad; and a bonding pad provided at the frame portion so as not to contact the lid portion and connected by wiring to the frame portion connection pad, for transmitting an electrical signal to outside of the acceleration sensor, wherein a plane of the beam portion facing the lid portion and a plane of the fixed portions facing the lid portion are in a same plane.