Inertial sensor

An inertial sensor comprising:

• an acceleration sensor;
• an angular velocity sensor;
• and
• a control circuit configured to control the acceleration sensor and the angular velocity sensor, wherein
• the acceleration sensor includes:
• a first movable section configured to respond to acceleration applied thereto;
• and
• a first electrode configured to displace the first movable section with an electrostatic force according to voltage application from the control circuit,
• the angular velocity sensor includes:
• a second movable section configured to respond to an angular velocity applied thereto;
• and
• a second electrode configured to displace the second movable section with an electrostatic force according to voltage application from the control circuit,
• a voltage signal input to the second electrode of the angular velocity sensor and a voltage signal input to the first electrode of the acceleration sensor are a same voltage signal,
• the voltage signal input to the first electrode of the acceleration sensor is a signal for detecting a mechanical failure, and
• a carrier signal for detecting displacement of the first movable section of the acceleration sensor has a frequency higher than a frequency of a signal applied to the first electrode.