Acceleration sensor

An acceleration sensor comprising:

• an acceleration detecting portion that detects an acceleration in a predetermined direction and an offset detecting portion that detects an offset amount with respect to the acceleration detecting portion;
• and
• wherein the acceleration detecting portion includes
• a first semiconductor substrate with a first cavity formed in its interior,
• a first fixed structure including a first fixed electrode that is supported, in a state of floating with respect to the first cavity, by the first semiconductor substrate, and
• a first movable structure including a first movable electrode that is supported, in a state of floating with respect to the first cavity, by the first semiconductor substrate via an elastic structure and is a first movable electrode displacing in the predetermined direction with respect to the first fixed electrode, and
• the offset detecting portion includes
• a second semiconductor substrate with a second cavity formed in its interior,
• a second fixed structure including a second fixed electrode that is supported, in a state of floating with respect to the second cavity, by the second semiconductor substrate,
• a second movable structure including a second movable electrode that is supported, in a state of floating with respect to the second cavity, by the second semiconductor substrate, and
• a disabling structure that disables a function of the second movable electrode displacing with respect to the second fixed electrode.