To provide an wear resistant aluminum alloy capable of showing sufficient wear resistance and seizure resistance even in the case of high bearing pressure and small oil-film thickness and also to provide a method of production of a sliding member using this aluminum alloy.

The wear resistant aluminum alloy is obtained by adding an alloy powder B, having a composition consisting of, by weight, 25-40% Si, 0.5-3.0% Cu, 0.3-3.0% Mg, and the balance essentially Al, to an alloy powder A, having a composition consisting of, by weight, 8-25% Si, 0.5-5.0% Cu, 0.3-3.0% Mg, and the balance essentially Al, by 25 to 40 wt.%, mixing them, compacting the resultant powder mixture into billet, and then extruding this billet. The average grain size of primary-crystal Si grains in this alloy is regulated to ≥10 μm. The sliding member is produced by pressing the wear resistant aluminum alloy into a cast aluminum alloy to fit it in the sliding part.