To provide a suspension system capable of efficiently supporting the vehicle body weight and preventing any negative pressure from being generated on the pull side even when a piston is suddenly displaced by using a single acting cylinder capable of preventing connection of pull sides to each other.

In the suspension system for supporting the vehicle body weight via an axle, two single-acting cylinders 10 and 10 are disposed on axles 6, 7, 8 and 9 in the longitudinal and right-and-left directions, and push sides located outside out of the single-acting cylinders adjacent to each other in the longitudinal direction, and push sides located inside of the single-acting cylinders adjacent to each other in the right-and-left direction are connected to each other via a pipe 12 and a pipe 13, respectively.