An inertial sensor (20) and an electronic device (100) are provided. Amass block (312 or 315) of the inertial sensor (20) for detecting a Y-axis is driven to have a displacement component in an X-axis direction. When the inertial sensor (20) is subject to an angular velocity component around a Z-axis, the mass block (312 or 315) for detecting the Y-axis may pull a mass block (313 or 316) for detecting the Z-axis, so that the mass block (313 or 316) for detecting the Z-axis can have a displacement component in a Y-axis direction. The inertial sensor (20) can implement principle decoupling between Y-axis detection and Z-axis detection, thereby helping to consider both a size and detection precision of the inertial sensor (20).