herein disclosed is a hollow rubber fender for absorbing kinetic energy of a ship approaching a quay . the fender comprises a substantially funnel - shaped frusto - conical hollow support portion made of an elastic rubber material ; a buffer portion being generally in a cylindrical form and extending from the smaller - diameter end of the support portion substantially in parallel with the longitudinal axis of the support portion ; and a mounting portion extending outwardly and integrally from the larger - diameter end of the support portion along a radial plane perpendicular to the longitudinal axis of the support portion ; the inside diameter r 1 of the larger - diameter end of the support portion and the outside diameter r 2 of the top end of the buffer portion being determined to satisfy the condition of r 1 ≧ r 2 .