To provide a rear spoiler which is lightweight with high stiffness, and excellent in design.

The rear spoiler has a vertical wing with a FRP hollow main body formed in a vertical wing shape and a foam core arranged only on the inner peripheral edge of the body, and a horizontal wing with a FRP hollow main body formed in a horizontal wing shape and a skirt part formed integrally at both wing ends of the body. The skirt part is mounted and assembled integrally inside or outside the vertical wing body.