There is provided an improved abrasion-resistant hydraulic hammer with a low noise level for preventing the leak-out of the noise made inside. The object is to provide an abrasion-resistant hydraulic hammer with a low noise level which can contribute to the establishment of a comfortable working environment and meet environmental standards against noise pollution by reducing leaked-out crashing sound. To achieve the object, a cylindrical plastic member containing oil is installed to a hole formed outward under a piston installed inside the hydraulic hammer, for guiding a tool in contact with the circumferential surface thereof.