(Meth)acrylate polymers are provided which have a narrow molecular weight distribution on a higher molecular weight side and can impart high shear viscosity stability to lubricating oils. A (meth)acrylate polymer (A) includes specific structural units and is such that in a differential molecular weight distribution curve obtained by gel permeation chromatography (GPC) measurement which shows the polystyrene-equivalent molecular weight of the (meth)acrylate polymer (A) normalized so that the intensity of the peak-top polystyrene-equivalent molecular weight M (t) is 1, the value a represented by a=Log Mh (t1/2)−Log M (t) is not more than 0.12 wherein Mh (t1/2) is the polystyrene-equivalent molecular weight at a point on a higher molecular weight side where the intensity is 0.5.