A pedestrian protection airbag apparatus includes an exterior front side airbag, and an exterior rear side airbag. The exterior front side airbag is disposed in a front portion of a side sill of a vehicle, and configured to, upon being supplied with gas, be expanded and deployed along a side surface of the vehicle. The exterior rear side airbag is disposed in a rear portion of the side sill of the vehicle, and configured to, upon being supplied with gas, be expanded and deployed along the side surface of the vehicle. An upper end portion of the exterior front side airbag is disposed lower than an upper end portion of the exterior rear side airbag.