To provide a bare bellows type air spring of single body completion type which securely and speedily changes a vehicle height adjusting suspension device into a vehicle height adjusting suspension device at low cost by easy work by effectively utilizing a pure suspension device mounted currently on a vehicle, and also provide the vehicle height adjusting suspension device by use of the bare bellows type air spring.

If the current pure suspension device of a vehicle is composed of a coil spring and a shock absorber, the pure coil spring is removed and the bare bellows type air spring is inserted merely to change the vehicle height adjusting suspension device very easily, securely, and quickly by effectively utilizing members mounted currently on the vehicle such as a pure upper mount and the shock absorber as they are without remodeling or changing a basic structure of a vehicle main body.Since a function of the bare bellows type air spring has a completion structure as a single body, it can be applied to the other vehicle and can be speedily and inexpensively mounted thereon without remodeling and changing a vehicle body and suspension device constituent parts.