ARM MATERIAL AND MANUFACTURING METHOD THEREFOR

摘要

PROBLEM TO BE SOLVED: To provide an arm material for an upper arm and a lower arm making up a double wish bone suspension, etc., of an automobile, in which the material has a flat and hollow closed sectional shape and is further reduced in size and weight and improved in strength.SOLUTION: An arm material 11 for a suspension of an automobile includes a body composed of a metal member. The metal member 11a has a flat and hollow closed sectional shape having a pair of long sides 12 and 13 opposite to each other, and is structured integrally in the longitudinal direction. The body at least has a first bent part 16 bent in a plane substantially parallel with the pair of long sides 12 and 13.