The present invention relates to an electrode assembly and secondary battery having the same. The electrode assembly of a secondary battery includes a positive electrode including a positive electrode active material layer, a negative electrode including a negative electrode active material layer, and a separator separating the positive and negative electrodes from each other. The separator includes a porous layer comprising a ceramic material and a binder, and a polyolefin-based resin layer. The porous layer has a centerline average roughness (Ra) of 0.3[mu]m to 1.5[mu]m, the polyolefin-based resin layer has a porosity of 30% to 60%, and the polyolefin-based resin layer has a compressibility of 4% to 10%.