A conveyor is provided with a supply roll, a detection device and a brake force applying device. The supply roll is rotatably arranged and is configured to support a belt-shaped cell material for an electrode or a separator to intermittently feeding out the cell material by rotation of the supply roll. The detection device is arranged with respect to the supply roll to detect an amount of the cell material remaining on the supply roll. The brake force applying device operatively coupled to the supply roll to apply brake force to the rotation of the supply roll based on the amount of the cell material detected by the detection device.