The present invention provides an external airbag system for a vehicle, the external airbag system including a detection sensor configured to detect an object moving at a rear or lateral side of a vehicle, an airbag cushion provided on a rear frame on which a door of the vehicle is mounted, the airbag cushion being configured to be deployed to extend in a leftward/rightward direction of the vehicle in a state in which the door of the vehicle is opened, and a control unit configured to perform control to deploy the airbag cushion when the detection sensor detects the object.
