An electrode lead of a pacemaker includes a metal conductive core, a carbon nanotube film, and an insulator. The metal conductive core defines an extending direction. The carbon nanotube film at least partially surrounds the metal conductive core and is electrically insulated from the metal conductive core. The insulator is located between the metal conductive core and the carbon nanotube film. The carbon nanotube film includes a plurality of carbon nanotubes substantially extending along the extending direction of the metal conductive core. A bared part is defined at one end of the electrode lead. A pacemaker using the above mentioned electrode lead is also disclosed.