IMPACT ABSORPTION MEMBER

There is provided an impact absorbing member that absorbs an impact by being crushed in an axial direction, the impact absorbing member having a cylindrical shape extending along the axial direction, in which when a cross section perpendicular to the axial direction of the impact absorbing member is set to a first cross section, and a cross section defined by extension lines of a plurality of sides in the first cross section is set to a second cross section, the second cross section is a polygon, the first cross section includes a shared vertex that is shared by the second cross section, and a recessed groove that is positioned to correspond to a vertex of the second cross section, and an interior angle of at least one vertex of the first cross section is 100° or more.