Lower arm for a vehicle suspension system

In order to allow easy manufacture and to enable high stability and low weight, a lower arm for a vehicle suspension system (100) comprising a first bush mounting part (110) and a second bush mounting part (120) is provided. A first arm (101) of the vehicle suspension system (100) has one end part connected to the first bush mounting part (110). A second arm (106) has one end part extending integrally from the first arm (101) and the other end part connected to the second bush mounting part (120). The first arm (101) is formed by forming a metal plate, the one end part of the first arm (101) connected to the first bush mounting part (110) has a pair of ring members which are formed by forming the metal plate to be parallel therebetween in an axial direction and to contact and support through their inner round surfaces an outer round surface of the first bush mounting part (110).