To provide a sole structure correcting a strain of a foot posture into a right posture without causing complication of the manufacture and a cost increase.

The sole 20 is constituted of an inner sole 21 having a downward recessed cross section and an outer sole 22 having an upward recessed cross section. The outer sole is fitted in the inner sole, one sides in the front-rear direction or width-direction are fixed together, the other sides are vertically movably provided, a volume-variable and airtight pressure space is formed between the inner sole and the outer sole, an injection valve 23 for injecting pressure fluid in the pressure space and retaining it is provided, and the bottom of the outer sole is inclined at an angle according to the pressure of the fluid.