To provide a vehicle suspension device capable of accurately detecting absolute positions of screw nuts 21a and 21b moving in an axial direction when changing a camber angle regardless of vibration applied during traveling or the like at a low cost.

An upper arm 4b configuring a vehicle suspension device includes a frame 9, an expansion mechanism 10 including a pair of feed screw mechanisms 19a and 19b, an electric motor 11, a gear type speed reducer 12, and a link mechanism 13. A sensor unit 41 in which a plurality of magnetic sensors are disposed at equal intervals in a width direction of a vehicle body is supported and fixed on the frame 9. On outer peripheral surfaces of guide cylinders 24a and 24b moving in the axial direction together with screw nuts 21a and 21b, magnetic detection patterns 42, 42 in which positions in relation to the peripheral directions of the outer peripheral surfaces are continuously changed according to axial positions and the axial positions correspond to the positions in relation to the peripheral directions one-to-one are directly formed.