Supported catalyst and fuel cell using the same

A supported catalyst, an electrode including the same, and a fuel cell using the electrode are provided. The supported catalyst includes a carbon-based catalyst support, catalytic metal particles adsorbed on a surface of the carbon-based catalyst support, and an ionomer chemically or physically absorbed to the surface of the carbon-based catalyst support and having a functional group capable of providing proton conductivity on an end. In the supported catalyst, the catalyst support performs an essential function of transporting protons in the formation of an electrode, thereby increasing the efficiency. When using an electrode prepared using the supported catalyst, a fuel cell having improved performances, such as energy density and efficiency of fuel, can be prepared.