SHOCK ABSORBER, SHOE SOLE, AND SHOE

A shock absorber (1) includes a shock absorbing portion (10) having a three-dimensional shape formed by a wall (11) in which an outer shape is defined by a pair of parallel curved surfaces. The shock absorbing portion (10) includes at least one three-dimensional structure body (12) obtained by changing a shape of a unit structure body (U') thickened based on a unit structure of a Schwartz P structure. The shape of the three-dimensional structure body (12) in an unloaded state is a shape obtained by changing the shape of the unit structure (S') so as to follow the shape change of the unit structure body (U'), which is a regular hexahedron shaped space occupied by the unit structure body (U'), into a trapezoidal space.