A device for measuring an angular position, comprising a rotating body (3) that oscillates relative to a supporting body (2) between two limit positions which are rotated one relative to the other by an angle of oscillation θ with amplitude that is less than or equal to 150°, a permanent magnet (5) that extends along an arc of extension that corresponds to an arc of a circle centred on the main axis of rotation (4), the arc of extension subtending an angle of extension α, and a magnetic sensor (6) positioned eccentrically relative to the main axis of rotation (4); the permanent magnet (5) and the magnetic sensor (6) being fixed one to the rotating body (3) and the other to the supporting body (2), and always being magnetically coupled; the following relation applying between the angle of extension α of the permanent magnet (5) and the angle of oscillation θ: α>θ−30°, and the permanent magnet (5) being diametrally polarized and having a direction of polarization (12) that forms an angle that is less than or equal to 10° relative to a straight line perpendicular to the main axis of rotation (4) and passing both through the main axis of rotation (4), and through a first end of the arc of extension.