A sliding bearing comprises steel back layer 1 and a copper-based sliding layer 2. The copper-based sliding layer 2 comprises (by weight): 6-12 % tin, 11-30 % bismuth, 0.01-0.05 % phosphorous, optionally 0.1-10 % in total of nickel, iron and/or silver, optionally 0.1-10 % in total of inorganic compounds, with the balance being Cu and impurities. The mass ratio of Bi to Sn is 1.7-3.4 and the mass ratio of Bi to P is 500-2100. The copper based sliding layer 2 comprises a copper-tin-phosphorous compound and bismuth grains 3 with an average area of 60-350 um2 when observed in a cross section parallel to a thickness direction of the layer.
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