Patent ID: 8312770

Claim:
A capacitive acceleration sensor including a first sealing substrate and a second sealing substrate each made of glass, the sensor comprising therebetween: an acceleration detecting portion, made of silicon, including: a mass body supported in the air to have predetermined gaps each to the first sealing substrate and to the second sealing substrate, a beam, connected to the mass body for supporting the mass body in the air, having elasticity to enable the mass body to be displaced, and a fixed electrode provided to face the mass body with a predetermined gap thereto; a bonding frame, made of silicon, provided so as to surround the periphery of the acceleration detecting portion; and one of the first sealing substrate and the second sealing substrate including, at a position thereof facing the mass body, a contact portion with which only at least one peripheral portion of the mass body comes into contact, the contact portion being level with a portion of the one of the first sealing substrate and the second sealing substrate facing the fixed electrode in a direction parallel with the mass body.