Drastic reduction in Pt usage is essential for the commercialization of fuel cell vehicles. Improvement of the activity for oxygen reduction reaction (ORR) of the Pt catalyst is a key technology for the reduction of Pt usage. In this report, development of shape-controlled Pt catalysts and Pt monolayer core/shell structured catalysts are described. The enhancement in ORR activity of these catalysts is demonstrated in comparison with a commercially available Pt catalyst.