Sole structure and shoe including same

A sole structure for a shoe, the sole structure comprising:

• a sole body made of an elastic material;
• and
• an adjustment mechanism provided in an intermediate portion of the sole body in a thickness direction, and capable of adjusting a length of the sole body in a foot width direction, wherein
• the sole body includes:
• a groove formed such that inner wall surfaces of the groove are caused to come close to, and separate from, each other in the foot width direction with the adjustment mechanism, and
• a transformable portion provided in the groove, extending in the foot width direction between the inner wall surfaces of the groove, and elastically transformable,
• the transformable portion includes:
• a pair of rising portions which are continuous with the inner wall surfaces of the groove and extend in the thickness direction while the inner wall surfaces have come close to each other, and
• a coupling portion that couples the rising portions to each other at one end, and
• a first cavity is provided between the inner wall surfaces of the groove and the rising portions, while a second cavity is provided between the rising portions.