<p>An air damper which, according to an input load, provides an appropriate damping force. An air damper is provided with the following: a tubular cylinder (1) having opposite ends open; a piston (2) moving in the cylinder (1); and a cap (3) for closing the opening in one end of the cylinder (1). The cylinder (1) has an annular seal surface (4) on the peripheral surface of the opening of the cylinder (1). The cap is mounted to the opening side of the cylinder (1) so as to be movable or deformable in the direction of the axis of the cylinder (1). The cap makes contact with and is separated from the seal surface (4) by a pressure variation caused by movement of the piston (2) in the cylinder (1). A first orifice (14) is formed in a base plate (12) of the cap. During operation of the first orifice (14), a second orifice having a smaller inflow area than the first orifice (14) is defined between the cap (3) and the cylinder (1).</p>
