Disclosed is a sliding bearing having excellent fatigue resistance property under a high specific load. The sliding bearing has a back metal layer 2, an Al-base alloy intermediate layer, and an Al-base bearing alloy layer which contains grains of an intermetallic compound consisting of Al and at least two other elements. The grains include relatively smaller size grains each having a grain size of less than 0.5 μm. The smaller size grains are dispersed in the Al-base bearing alloy layer with a density of not less than eight grains per 1 μm2 in an optional sectional area of the Al-base bearing alloy layer