A micro-machined inertial angular sensor comprising: - two vibrating masses (M1, M2), which are machined in a generally flat support wafer and are movable relative to the wafer and relative to one another, suspended from fixed anchoring points of the wafer by suspension springs and coupled together by coupling springs in order to vibrate in phase opposition; characterised in that the sensor comprises: - at least one transducer (Ex) for exciting a vibration movement of one of the masses in a direction X in the plane of the wafer, a transducer (Ey) for exciting said mass in a direction Y perpendicular to the direction X and in the plane of the wafer, a transducer (Dx) for detecting a vibration of one of the masses in the direction X and a transducer (Dy) for detecting a vibration of one of the masses in the direction Y, the excitation (Ex, Ey) and detection (Dx, Dy) transducers each comprising a pair of interdigitated combs having a movable comb formed by a row of teeth rigidly connected to the vibrating mass and a fixed comb formed by a row of teeth rigidly connected to a fixed electrode, the interdigitation of the teeth at rest being dissymmetrical; - at least one first frequency adjustment electrostatic transducer (Tx), with interdigitated combs with symmetrical interdigitation at rest, capable of applying an adjustable electrostatic stiffness to the vibrating mass in the direction X, and a second frequency adjustment electrostatic transducer (Ty) similar to the first and capable of applying an adjustable electrostatic stiffness to the vibrating mass in the direction Y; and in that: - the two movable vibrating masses are disposed one around the other, as an inner mass and an outer mass, and their centres of gravity coincide at rest; - the coupling springs are each linked on one side to the inner mass and on the other side to the outer mass and they have identical stiffnesses in the direction X and in the direction Y; - the stiffnesses of the springs for suspending the inner mass are identical in the direction X and in the direction Y and the stiffnesses of the springs for suspending the outer mass are identical in the direction X and in the direction Y, and they are proportional to the values (m1 and m2) of the respective masses; - the structure of the movable assembly formed by each vibrating mass and the parts of transducers rigidly connected to said mass is generally symmetrical relative to an axis of symmetry OX parallel to the direction X and passing through the centre of gravity of the mass, and is also generally symmetrical relative to an axis of symmetry OY parallel to the direction Y and passing through the centre of gravity of the mass. - two vibrating masses (M1, M2), which are machined in a generally flat support wafer and are movable relative to the wafer and relative to one another, suspended from fixed anchoring points of the wafer by suspension springs and coupled together by coupling springs in order to vibrate in phase opposition; - at least one transducer (Ex) for exciting a vibration movement of one of the masses in a direction X in the plane of the wafer, a transducer (Ey) for exciting said mass in a direction Y perpendicular to the direction X and in the plane of the wafer, a transducer (Dx) for detecting a vibration of one of the masses in the direction X and a transducer (Dy) for detecting a vibration of one of the masses in the direction Y, the excitation (Ex, Ey) and detection (Dx, Dy) transducers each comprising a pair of interdigitated combs having a movable comb formed by a row of teeth rigidly connected to the vibrating mass and a fixed comb formed by a row of teeth rigidly connected to a fixed electrode, the interdigitation of the teeth at rest being dissymmetrical; - at least one first frequency adjustment electrostatic transducer (Tx), with interdigitated combs with symmetrical interdigitation at rest, capable of applying an adjustable electrostatic stiffness to the vibrating mass in the direction X, and a second frequency adjustment electrostatic transducer (Ty) similar to the first and capable of applying an adjustable electrostatic stiffness to the vibrating mass in the direction Y; - the two movable vibrating masses are disposed one around the other, as an inner mass and an outer mass, and their centres of gravity coincide at rest; - the coupling springs are each linked on one side to the inner mass and on the other side to the outer mass and they have identical stiffnesses in the direction X and in the direction Y; - the stiffnesses of the springs for suspending the inner mass are identical in the direction X and in the direction Y and the stiffnesses of the springs for suspending the outer mass are identical in the direction X and in the direction Y, and they are proportional to the values (m1 and m2) of the respective masses; - the structure of the movable assembly formed by each vibrating mass and the parts of transducers rigidly connected to said mass is generally symmetrical relative to an axis of symmetry OX parallel to the direction X and passing through the centre of gravity of the mass, and is also generally symmetrical relative to an axis of symmetry OY parallel to the direction Y and passing through the centre of gravity of the mass.