To suppress a change in shoe inner volume in wearing the shoe while securing the cushion property.

This insole structure 1 comprises an upper part insole 2 made of a soft elastic member and extending from a heel part A of the shoe to a front foot part C via a middle foot part B; a lower part insole 3 made of soft elastic member and disposed in the lower part of the upper part insole 2; and a waveform sheet 4 interposed between the upper/lower insoles 2 and 3 and having a waveform part 40. In this case, the upper part insole 2 can improve the abutment feeling of the foot, and the lower part insole 3 can suppress the change in the shoe inner volume in wearing the shoe while securing the cushion property in grounding.