Abstract: A running machine belt is a belt rotated by a driving roller of a running machine main body. The running machine belt is formed in an endless shape and in width enough for allowing a person to stand thereon. The running machine belt includes a core belt formed of at least one kind of fiber material, a soft layer provided on a front surface of the core belt on which the person stands, and a graphite paint layer provided on a rear surface of the core belt that comes into contact with the driving roller.