Acceleration sensor

An acceleration sensor comprising:

• a fixation member;
• a weight member including two opposing sides parallel or substantially parallel to a first direction and two opposing sides parallel or substantially parallel to a second direction perpendicular or substantially perpendicular to the first direction when looked at in a plan view, the weight member including a cutout that extends in a direction of about 45° relative to the first direction and the second direction;
• a vibrating beam that linearly extends in the direction of about 45° relative to the first direction and the second direction when looked at in a plan view, and including a first end portion connected to the fixation member and a second end portion connected to the weight member, the vibrating beam being partially arranged within the cutout and supporting the weight member to be displaceable in a third direction that is perpendicular or substantially perpendicular to the first direction and the second direction;
• a driver disposed on the vibrating beam and vibrating the vibrating beam;
• and
• a detector disposed on the vibrating beam and configured to output a detection signal that is changed depending on deformation of the vibrating beam.