A suspension system suitable for a small-sized vehicle such as an all terrain vehicle. A strut damper is arranged wherein a downwardly extending line of an axis of the strut damper is located in front of a drive shaft extending to the depth of a drawing from the rotational center of a front wheel. As interference between the strut damper and the drive shaft is not a concern, a mounting position of the strut damper can be fully lowered. In addition, the length of the axis of the strut damper can be fully secured. Therefore, the height of the vehicle can be lowered. In addition, the design of a vehicle body is facilitated.