An angular velocity sensor comprising: a package; an angular velocity sensor element including a tuning-fork type vibrator disposed in the package; a seat that supports the angular velocity sensor element to ensure a vibrating space of the angular velocity sensor element; and a step-shaped member made of one flexible plate-spring material or of one flexible elastic material that suspends the seat in an internal space of the package such that disturbance vibration is not transmitted through the package to the angular velocity sensor element, wherein the step-shaped member includes: a connection portion to the package; and a suspension portion located between the connection portion and a connection portion to the seat, the height of a barycentric position of the suspension portion between the connection portions (8c, 8d) is matched with the height of a barycentric position of a composite body of the angular velocity sensor element, the seat, and the connection portion to the seat, where the height of the barycentric position of the suspension portion and the height of the barycentric position of the composite body are defined with respect to a vibration plane in the driving vibration of the angular velocity sensor element, and wherein the suspension portion includes: a first portion with a surface extending parallel to the vibration plane in the driving vibration of the angular velocity sensor element; a second portion having a first end coupled to the first portion and a second end, the second portion being orthogonal to the first portion and extending orthogonal to the vibration plane in the driving vibration of the angular velocity sensor element; a third portion coupled to the second end of the second portion, and extending parallel to the first portion, the first, second and third portions thus forming a step-shape. a package; an angular velocity sensor element including a tuning-fork type vibrator disposed in the package; a seat that supports the angular velocity sensor element to ensure a vibrating space of the angular velocity sensor element; and a step-shaped member made of one flexible plate-spring material or of one flexible elastic material that suspends the seat in an internal space of the package such that disturbance vibration is not transmitted through the package to the angular velocity sensor element, wherein the step-shaped member includes: a connection portion to the package; and a suspension portion located between the connection portion and a connection portion to the seat, a connection portion to the package; and a suspension portion located between the connection portion and a connection portion to the seat, the height of a barycentric position of the suspension portion between the connection portions (8c, 8d) is matched with the height of a barycentric position of a composite body of the angular velocity sensor element, the seat, and the connection portion to the seat, where the height of the barycentric position of the suspension portion and the height of the barycentric position of the composite body are defined with respect to a vibration plane in the driving vibration of the angular velocity sensor element, and wherein the suspension portion includes: a first portion with a surface extending parallel to the vibration plane in the driving vibration of the angular velocity sensor element; a second portion having a first end coupled to the first portion and a second end, the second portion being orthogonal to the first portion and extending orthogonal to the vibration plane in the driving vibration of the angular velocity sensor element; a third portion coupled to the second end of the second portion, and extending parallel to the first portion, the first, second and third portions thus forming a step-shape. a first portion with a surface extending parallel to the vibration plane in the driving vibration of the angular velocity sensor element; a second portion having a first end coupled to the first portion and a second end, the second portion being orthogonal to the first portion and extending orthogonal to the vibration plane in the driving vibration of the angular velocity sensor element; a third portion coupled to the second end of the second portion, and extending parallel to the first portion, the first, second and third portions thus forming a step-shape.