AIRBAG

There is provided an airbag in which there are fewer restrictions in a place for setting a tension member and a place for setting a vent hole. Airbag () of the present invention has bag-shaped airbag main body (), tension member () disposed inside airbag main body (), and vent hole () provided in airbag main body (). In two-dimensional view in which an inner side of inflated and deployed airbag main body () is viewed from a direction orthogonal to vent hole () via vent hole (), tension member () has wrap portion () disposed at a position overlapping vent hole (), and a dimension of at least a part of wrap portion () in an orthogonal direction is smaller than a gap of a portion of vent hole (), which corresponds to wrap portion (), in the orthogonal direction.