BRASS-PLATED STEEL WIRE FOR REINFORCING RUBBER ARTICLES

This disclosure is to provide a brass-plated steel wire for reinforcing a rubber article, which is capable of improving the initial adhesiveness, heat-resistant adhesiveness and initial adhesion rate. This disclosure is a brass-plated steel wire for reinforcing a rubber article, wherein: when measured with XPS (X-ray photoelectron spectroscopy), an outermost surface contains zinc at an amount of 4.8 atom% or less, phosphorus at an amount of 0.5 atom% or more, and oxygen at an amount of 50 atom% or less; and in the outermost surface, an atomic ratio of copper to zinc is 1 to 6.