Abstract: A ventilation structure of a shoe sole of the present invention includes the shoe sole (1) formed with a through hole (5) vertically passing therethrough. The through hole (5) is fitted with a ventilation part (6). The ventilation part (6) comprises a flange portion (60) and the projection (61). The flange portion (60) engages the upper surface (2a) of the shoe sole (1) so that the ventilation part (6) does not drop off the through hole (5). The projection (61) extends into the through hole (5). The projection (61) is provided with a vent hole (62) vertically passing therethrough for the passage of air.