PURPOSE: To improve appearance and durability of a fender by a method wherein a reinforcing code layer composed codes arranged at an angle other than still angle is formed over the whole of an elastic film, and one or more rings directed to the circumferential direction are buried at an interval in the axial direction of the cylinder.

CONSTITUTION: When a shock receiver plate 10 is pressed by collision of the hull, an elastic film 2 is compressed to raise the inner pressure, and the diameter of a ring part 2a in which a ring code 6 is buried is maintained and the diameter of the ring part 2b between the other ring codes 6 is expanded. to cause the compressive deformation of the film 2. By raising the pressure of air confined by the deformation of the film 2, the board-contact energy is absorbed to exhibit a shock-absorbing effect. In the fender device 1 in which the film 2 is compressed, large-diameter portions and small-diameter portions are alternately arranged uniformly and regularly to form bellows to raise the appearance. The film 2 has bent portions all over the axial direction of cylinder and resistance against fatigue and damage can be greatly improved without causing locally concentrated strain. Even durability can be enhanced.