In one form, an airbag is provided including an airbag main body formed into a pouch; an inner restricting cloth that comprises a tearable tear line and wraps and restricts the airbag main body that is in a first folded state, folded to achieve bundling toward a predetermined direction, in the bundled direction; and an outer restricting cloth that comprises a tearable tear line and wraps and restricts the airbag main body that is in a second folded state, folded to achieve further bundling from the first folded state toward a direction orthogonal to the predetermined direction, in the bundled direction further on the outside than the inner restricting cloth.