Disclosed herein is a method of folding a far-side airbag, which includes forming a first folding part in such a manner that an upper side of an airbag seat is folded inboard, forming a second folding part by folding both widthwise sides of the airbag seat, forming a third folding part by folding the upper side of the airbag seat, forming a roll-folding part by roll-folding the upper side of the airbag seat, forming an overlapping part by folding over an inflator of the airbag seat, and folding the roll-folding part so that the roll-folding part overlaps the overlapping part.