To easily obtain a sliding member made of an Al alloy having a smooth surface and low in the coefficient of fraction by applying a basis composed of an Al alloy with an anodic oxide layer and working the projecting tip parts of alumina particles projecting at random on the surface into a flat shape by roller burnishing tools.

An anodic oxide layer is formed on the internal face of a cylinder 1 made of an Al alloy by aodic oxidation treatment. The anodic oxide layer on the internal wall 2 is subjected to smooth working by roller burnishing tools 3 formed by providing a supporting body 5 with plural rollers 4. In this way, the tip parts of alumina particles uniformly projecting in the anodic oxide layer are indented, and the surface is smoothly subjected to mirror finishing. At this time, the recessed parts among the alumina particles are allowed to remain to secure the retaining parts of lubricating oil. Furthermore, particles for compounding such as solid lubricants are previously applied and stuck to the surface of the anodic oxide layer, and the working is executed by the roller burnishing tools, by which the smoothing of the anodic oxide layer is attained, and furthermore, the grains for compounding can easily and uniformly be dispersed therein.