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This paper shows the lightening approach for small vehicles by developing lower arm of the hollow extruded aluminum, which is the low cost material and has closed cross section. The manufacturing cost was reduced by developing the industrial method to form the developed lower arm of the extruded aluminum by cold press, without welding. In addition, the developed method forming of the heat-treated extruded aluminum reduces the manufacturing cost more, compared to the conventional method forming before the heat treating. The structure of the developed lower arm has the wide center part receiving the coil spring and the narrow end part connecting to the vehicle body with the bush. The center part has the same cross section as the extruded aluminum, and the end part was formed by shrinking the extruded aluminum by cold press.