A hair iron is capable of preventing hair under treatment from drying.The hair iron has clamp arms. Heads of the clamp arms are provided with relaxing bodies that face each other. The relaxing bodies have respective thermal plates. The thermal plates heat and correct hair held between the relaxing bodies. A relaxing surface of at least one of the relaxing bodies has a platinum layer formed on a base material. Between the base material and the platinum layer, a titanium dioxide layer is formed. Between the base material and the titanium dioxide layer, a nickel layer is formed. Between the titanium dioxide layer and the platinum layer, a nickel layer is formed. A magnet plate is arranged behind the thermal plate and is extended along the relaxing surface.