ATTACHMENT STRUCTURE FOR UPPER ARM OF DOUBLE WISHBONE SHOCK ABSORBER

The double wishbone shock absorber includes an upper arm that is pivotally supported by a side member having a rectangular cylindrical shape at an inner end thereof, and a lower arm that is pivotally supported by the suspension member at an inner end thereof and is pivotally supported at a lower end of the suspension at an outer end thereof. In a region of the side member that pivotally supports the inner end of the upper arm, an opening extending from the outer side hanging wall portion of the side member to the bottom wall portion is provided. A reinforcing member that closes the opening is attached to the opening. The reinforcing member is provided with a rigid portion for increasing rigidity.