In a pedestrian protection airbag system, an airbag module extending in the lateral direction of a vehicle body is disposed between a rear edge of a hood and a front edge of a cowl top, thereby mounting the airbag module without affecting the intake of air into a vehicle compartment or the positioning of wipers; and the left and right ends of the airbag module are supported by upper parts of left and right front wheel damper housings, whereby the damper housings obtain a high rigidity to reliably bear a reaction force during deployment of an airbag without particularly enhancing the rigidity of the cowl top. Thus, it is possible to rigidly support the airbag module in the pedestrian protection airbag system while minimizing the influence on the shape or structure of the cowl top.