The present invention provides a roof airbag for a vehicle, the roof airbag including an airbag cushion mounted on a roof panel of a vehicle and configured to deploy downward from the roof panel to a location between front and rear passengers seated while facing one another, a front tether configured to surround an outer portion of the airbag cushion and having one end connected to a front side of the airbag cushion and the other end connected to the airbag cushion, and a rear tether configured to surround the outer portion of the airbag cushion and having one end connected to a rear side of the airbag cushion and the other end connected to the airbag cushion, in which the front and rear tethers surround the outer portion of the airbag cushion while intersecting each other.