An aluminum alloy brazing sheet comprising: a core material made of an aluminum alloy including 0.3 mass % to 1.2 mass % of Si, 0.1 mass % to 1.5 mass % of Cu, and 0.3 mass % to 2.0 mass % of Mn, the core material optionally including at least one or more of 0.01 mass % to 0.3 mass % of Cr, 0.01 mass % to 0.3 mass % of Zr, 0.01 mass % to 0.3 mass % of Ti, and 0.01 mass % to 0.3 mass % of V, the core material optionally including one or two of 0.05 mass % to 1.0 mass % of Fe and 0.1 mass % to 1.0 mass % of Mg, with the balance being Al and unavoidable impurities; a brazing material cladded onto one side surface of the core material, and made of an aluminum alloy including 4.0 mass % to 13 mass % of Si, the brazing material optionally including 5.0 mass % or less of Zn, with the balance being Al and unavoidable impurities; and a sacrificial anode material cladded onto the other side surface of the core material, and made of an aluminum alloy including 1.0 mass % to 8.0 mass % of Zn and 0.5 mass % to 1.5 mass % of Si, the sacrificial anode material optionally including at least one or more of 0.01 mass % to 0.3 mass % of Cr, 0.01 mass % to 0.3 mass % of Zr, 0.01 mass % to 0.3 mass % or Ti, and 0.01 mass % to 0.3 mass % of V, the sacrificial anode material optionally including one or two of 0.05 mass % to 0.5 mass % of Fe and 0.1 mass % to 2.5 mass % of Mg, with the balance being Al and unavoidable impurities, wherein a total number density of single phase pure Si and a Si-including intermetallic compound, existing in the sacrificial anode material and having a grain size of 0.1 μm or more and 1.0 μm or less is 1×10 3 /mm 2 or more and 1×10 6 /mm 2 or less. a core material made of an aluminum alloy including 0.3 mass % to 1.2 mass % of Si, 0.1 mass % to 1.5 mass % of Cu, and 0.3 mass % to 2.0 mass % of Mn, 0.3 mass % to 1.2 mass % of Si, 0.1 mass % to 1.5 mass % of Cu, and 0.3 mass % to 2.0 mass % of Mn, the core material optionally including at least one or more of 0.01 mass % to 0.3 mass % of Cr, 0.01 mass % to 0.3 mass % of Zr, 0.01 mass % to 0.3 mass % of Ti, and 0.01 mass % to 0.3 mass % of V, 0.01 mass % to 0.3 mass % of Cr, 0.01 mass % to 0.3 mass % of Zr, 0.01 mass % to 0.3 mass % of Ti, and 0.01 mass % to 0.3 mass % of V, the core material optionally including one or two of 0.05 mass % to 1.0 mass % of Fe and 0.1 mass % to 1.0 mass % of Mg, 0.05 mass % to 1.0 mass % of Fe and 0.1 mass % to 1.0 mass % of Mg, with the balance being Al and unavoidable impurities; a brazing material cladded onto one side surface of the core material, and made of an aluminum alloy including 4.0 mass % to 13 mass % of Si, the brazing material optionally including 5.0 mass % or less of Zn, with the balance being Al and unavoidable impurities; and a sacrificial anode material cladded onto the other side surface of the core material, and made of an aluminum alloy including 1.0 mass % to 8.0 mass % of Zn and 0.5 mass % to 1.5 mass % of Si, 1.0 mass % to 8.0 mass % of Zn and 0.5 mass % to 1.5 mass % of Si, the sacrificial anode material optionally including at least one or more of 0.01 mass % to 0.3 mass % of Cr, 0.01 mass % to 0.3 mass % of Zr, 0.01 mass % to 0.3 mass % or Ti, and 0.01 mass % to 0.3 mass % of V, 0.01 mass % to 0.3 mass % of Cr, 0.01 mass % to 0.3 mass % of Zr, 0.01 mass % to 0.3 mass % or Ti, and 0.01 mass % to 0.3 mass % of V, the sacrificial anode material optionally including one or two of 0.05 mass % to 0.5 mass % of Fe and 0.1 mass % to 2.5 mass % of Mg, 0.05 mass % to 0.5 mass % of Fe and 0.1 mass % to 2.5 mass % of Mg, with the balance being Al and unavoidable impurities, wherein a total number density of single phase pure Si and a Si-including intermetallic compound, existing in the sacrificial anode material and having a grain size of 0.1 μm or more and 1.0 μm or less is 1×10 3 /mm 2 or more and 1×10 6 /mm 2 or less. <EOS>