Inertial sensor

Disclosed herein is an inertial sensor including: a driving body displaceably supported on a flexible substrate part in a floating state; a displacement detection unit having a sensing electrode detecting displacement of the driving body; a vibrating part having a vibrating electrode vibrating the driving body; a differential amplifier connected to the sensing electrode and the vibrating electrode, and a circuit unit connected to the differential amplifier to calculate acceleration and angular velocity, wherein the acceleration is calculated by using the sensing electrode and the vibrating electrode.