Abstract: Present invention relates to a hand rail driving pulley for a passenger conveyor. According to the invention, when difference between the moving velocity of a step and the moving velocity of a hand rail generates, by adjusting the radius of the driving pulley, the velocity difference can be synchronized without any change of new part. And present invention discloses a new installing method of elastic contacting ring inserted into a groove not the conventional adhering method, so when a worn contacting ring is changed, changing work can be done easily and simply.