A pedestrian airbag apparatus includes a folded airbag and an inflator that supplies an inflation gas to the airbag. Upon completion of the inflation, the airbag includes a transversal inflation portion, two longitudinal inflation portions, and partitions including end-side partitions arranged to extend from both left and right ends of the transversal inflation portion inward in the left and right direction and thus to block front side regions of the longitudinal inflation portions. The airbag further includes tethers limiting a spacing distance from a storage portion for the airbag by connecting proximal portion sides of the tethers to regions on distal end sides of the end-side partitions and connecting distal end sides of the tethers to the storage portion.