A fender device attached to a boarding surface at which a ship berths, comprising: a tubular shock-absorbing member , made of an elastic material, having a center axis extending in a normal direction of the boarding surface , compressed in a direction of the center axis, and buckling in a compression process, wherein the shock-absorbing member has an inner surface , and comprises a first convex part that is formed on the inner surface along a peripheral direction during non-compression and a second convex part that is formed in the vicinity of the first convex part on the inner surface along the peripheral direction during non-compression, the inner surface comprises a first peripheral line (L1) defining a boundary of the first convex part that is a boundary opposite the second convex part and a second peripheral line (L2) defining a boundary of the first convex part that is a boundary on a second convex part side, and a third peripheral line (L3) defining a boundary of the second convex part that is a boundary opposite the first convex part , the shock-absorbing member bends along the first peripheral line (L1) and the second peripheral line (L2) during buckling, and a line representing the inner surface on a cross section of the shock-absorbing member is not smoothly continuous at a position of a point representing the first peripheral line (L1) during non-compression of the shock-absorbing member , and a line representing the inner surface on a cross section of the shock-absorbing member is smoothly continuous before and after a point representing the third peripheral line (L3) during non-compression of the shock-absorbing member . a tubular shock-absorbing member , made of an elastic material, having a center axis extending in a normal direction of the boarding surface , compressed in a direction of the center axis, and buckling in a compression process, wherein the shock-absorbing member has an inner surface , and comprises a first convex part that is formed on the inner surface along a peripheral direction during non-compression and a second convex part that is formed in the vicinity of the first convex part on the inner surface along the peripheral direction during non-compression, the inner surface comprises a first peripheral line (L1) defining a boundary of the first convex part that is a boundary opposite the second convex part and a second peripheral line (L2) defining a boundary of the first convex part that is a boundary on a second convex part side, and a third peripheral line (L3) defining a boundary of the second convex part that is a boundary opposite the first convex part , the shock-absorbing member bends along the first peripheral line (L1) and the second peripheral line (L2) during buckling, and a line representing the inner surface on a cross section of the shock-absorbing member is not smoothly continuous at a position of a point representing the first peripheral line (L1) during non-compression of the shock-absorbing member , and a line representing the inner surface on a cross section of the shock-absorbing member is smoothly continuous before and after a point representing the third peripheral line (L3) during non-compression of the shock-absorbing member . <EOS>