Acceleration sensor and electronic apparatus

A physical quantity sensor comprising:

• three mutually orthogonal axes being defined as an X-axis, a Y-axis, and a Z-axis;
• a base substrate including a first surface and a second surface in a front-back relationship orthogonal to the Z axis,
• a first fixed electrode and a second fixed electrode provided on the first surface along the X axis,
• a sensor member, the sensor member being configured with:
• a first member facing the first fixed electrode via a first gap along the Z-axis;
• a second member facing the second fixed electrode via a second gap along the Z-axis, the second member having a larger mass than the first member;
• and
• a swing axis that extends along the Y-axis, the swing axis dividing the sensor member into the first member and the second member, the sensor member being swingable about the swing axis, and
• in a state in which the sensor member is undergoing no swinging about the swing axis,
• the first member is spaced apart from the first fixed electrode in a Z-axis direction by:
• a first distance proximal to the swing axis;
• a second distance distal from the swing axis;
• and
• the first distance is smaller than the second distance;
• and
• the second member is spaced apart from the second fixed electrode in the Z-axis direction by:
• a third distance proximal to the swing axis;
• a fourth distance distal from the swing axis;
• and
• the third distance is smaller than the fourth distance.