Two Pd-based PtPd bimetallic catalysts (mole ratio of Pt to Pd=1 : 18) were prepared by co-impregnation (Pt-Pd/C) and sequential impregnation of Pt on Pd/C [Pt(Pd/C)] for the application to oxygen reduction reaction (ORR). The prepared bimetallic catalysts had lower ORR activities than Pt/C, while they showed largely enhanced activity compared to Pd/C. In particular, the extent of enhancement was found to be dependent on the surface composition. The observed mass and specific activities of Pt(Pd/C) were more than two times higher than those of Pt-Pd/ C. The superior activity of Pt(Pd/C) observed from the performed studies was attributed to its Pt-rich surface.