A buffer stopper capable of increasing an absorbable energy amount without causing changes in characteristics due to wear of a buffer body. In order to achieve the object, the buffer body containing a rubber elastic body disposed between an end surface formed in a housing and an end surface formed in a shaft which is relatively movable in the axial direction with respect to the housing and a wear resistant sheet which is provided so as to surround the outer peripheral surface of the buffer body and which can contact an inner peripheral surface of the housing by expansion and deformation in the radial direction of the buffer body are provided.

A buffer stopper capable of increasing an absorbable energy amount without causing changes in characteristics due to wear of a buffer body. In order to achieve the object, the buffer body containing a rubber elastic body disposed between an end surface formed in a housing and an end surface formed in a shaft which is relatively movable in the axial direction with respect to the housing and a wear resistant sheet which is provided so as to surround the outer peripheral surface of the buffer body and which can contact an inner peripheral surface of the housing by expansion and deformation in the radial direction of the buffer body are provided.

An auxetic structure includes a plurality of polyhedral units arranged adjacent one another to form a three-dimensional structure. Each polyhedral unit has protrusions extending orthogonally from some surfaces thereof and recesses formed in other surfaces thereof. The protrusions of each polyhedral unit are slidingly received in corresponding recesses of adjacent polyhedral units. A plurality of sleeves are positioned around each protrusion and in a corresponding recess. The sleeves are formed from a softer material than the protrusions. An auxetic effect is achieved by shear-induced displacement of the protrusions in corresponding recesses.