A structure including hard bone portion extending to a sole side face outer side at a time of pressure reception, and elastic soft skin portion provided at an outer side of the hard bone portion, absorbs impact at a time of landing and the like, where at least part of the hard bone portion is along sole side face, and the elastic soft skin portion have a structure wherein at a time of pressure reception, the hard bone portion undergoes bending deformation in a vertical section to extend to the sole lateral side, and by receiving the deformation, the elastic soft skin portion undergoes elastic deformation to bulge to the sole lateral side to absorb a received pressure load, thereafter, with decompression, the elastic soft skin portion undergoes elastic deformation to contract to the sole inner side, and with this, the hard bone portion is restored to an initial state.