A belt is entrained on a plurality of rollers and runs when the rollers are driven to rotate. A bead is attached to the belt and prevents the belt-like member from running crooked. The bead includes a first layer formed of a first material having a first hardness and a second layer formed of a second material having a second hardness. The second layer is laminated on the first layer. The bead is attached to the belt with the first layer being closer to the belt than the second layer. The first material and the second material expand simultaneously with temperature and humidity, and the first material and the second material contract simultaneously with temperature and humidity. The first hardness is higher than the second hardness.