To provide an air suspension device with the piezoelectric conversion function of a vehicle, which can secure electric power usable for on-vehicle electric equipment from large vibration energy when absorbing a shock of an air spring.

There is provided a piezoelectric element 30 for generating AC electric power by the piezoelectric effect generated when absorbing a shock of road surface vibration, inside the air spring 15 for an air suspension interposed between a chassis frame 1 and an axle 14, and the electric power generated by the piezoelectric element 30 is supplied to a storage battery 40 being a power supply of the electric equipment mounted on the vehicle. With this constitution, the large vibrational energy when absorbing the shock of the air spring 15 disposed of so far, is converted into the electric power by the piezoelectric element 30, and is stored in the storage battery 40, and the electric power stored in the storage battery 40 is used for the on-vehicle electric equipment 6.