PROBLEM TO BE SOLVED: To provide a hollow structure, and a method for manufacturing the same, providing an energy absorption function to compression force both in the axial direction and in the radial direction, while achieving high strength to axial tension and bend deformation.
SOLUTION: The hollow structure comprises a cylindrical member, having a plurality of diametrically expanded parts 2A formed at an interval along its axial direction. Between the plurality of diametrically expanded parts 2A, cylindrical connection parts 3A are provided. The diametrically expanded part 2A has the inner diameter that is larger than the inner diameter of the connection part 3A, and the outer diameter that is larger than the outer diameter of the connection part 3A. A certain degree of strength is maintained up to specified compression to cause deformation, regardless of the application direction of compression force. When the specified compression is exceeded, the energy absorption function is achieved. The hollow structure 1A has great tensile strength to tensile force along the axial direction, thereby strength to tension and bend deformation are increased.