Abstract: The invention provides an airbag apparatus for pedestrian protection disposed below a rear portion of a hood and near a windshield of an automobile. The airbag apparatus includes an inflator, an airbag, a receiver and an air-guiding tube. The airbag includes a main bag portion with a plurality of air rooms. The receiver, fixed below the rear portion of the hood, is for the receiving of the airbag with a guiding opening. The air-guiding tube is connected with the inflator and disposed inside the airbag. The air-guiding tube has a peripheral surface on which a plurality of flow-distributing holes corresponding to the air rooms are formed. Thereby, air supplied by the inflator can flow into the airbag through the flow-distributing holes such that the airbag thrusts out from the guiding opening of the receiver to the windshield and covers the windshield and two pillars adjacent to the windshield.