Patent ID: 7252314

Claim:
A crash energy absorption member formed from a tubular body for absorbing impact energy by buckling when it receives an impact load in the axial direction from one end in the axial direction, characterized in that it has a transverse cross-sectional shape along at least a portion in the axial direction which is a closed cross section having a generally polygonal shape and which has no flange on the outside of the closed cross section, and in a region of at least one side of a basic cross section defined as the polygon having the largest area of polygons obtained by connecting with straight lines a portion of a plurality of vertices constituting the generally polygonal shape, at least one groove which is recessed towards the inside of the basic cross section is provided in a location other than at an end point of the side, and remaining regions of the side outside the above-mentioned region of the side having the at least one groove have a generally straight shape.