To provide a bending strength member with high energy absorption performance.

This bending strength member comprises an aluminum alloy hollow shape 1 having a nearly rectangular cross section formed by flanges 4, 5 and webs 2, 3. The ratio (b/tf) of the width (b) and the thickness (tf) of the flange 4 which is on the compressed side when a bending load (A) acts on the hollow shape 1 exceeds 5, and the ratio (h/tw) of the width (h) and the thickness (tw) of the webs 2, 3 exceeds 5. The local elongation of the aluminum alloy material of the hollow shape 1 at a tension test is 2.5% or more. At bending deformation of the hollow shape 1 by the bending load (A), facing surfaces 4a, 4b of the flange 4 which is bent-deformed on the compressed side contact and interfere each other so as to prevent bending deformation of each other.