SUSPENSION ARM

A suspension arm made of an aluminum alloy extruded profile having a portion forming a bottom portion (43), portions forming at least two vertical walls (41, 42), and a horizontal rib (44) which connects the two vertical walls, wherein a suspension part lower end support portion is formed between the two vertical walls or at the bottom portion by removing a part of the horizontal rib. It is preferable to gradually change the interval between the two vertical walls in the portion in which the horizontal rib is removed.