An air spring according to the present invention is provided with: an inner cylinder; an outer cylinder which is provided on the inner cylinder; a diaphragm which is connected to the outer cylinder and the inner cylinder; and a stopper which is provided so as to be capable of rotating in the circumferential direction of the inner cylinder. The stopper is provided with stopper protrusions which protrude towards the outer cylinder side, and which move along the circumferential direction on the inner cylinder. The outer cylinder is provided with a plurality of stopper protrusions which protrude towards the inner cylinder side. Each of the plurality of outer cylinder protrusions has a different height. The outer cylinder protrusions and/or the stopper protrusions are capable of being restoredwith respect to deformation in the circumferential direction.