To enable the working condition to be easily recorded, followed up, managed without lowering the performance of a covered roller.

In the covered roller with an authentication device, a small size transmitter which is capable of external operation or guidance which can process character-numerical, codes of plural digits, is mounted to a roller core so that it cannot be removed nondestructively. It is desirable that the small size transmitter can withstant the temperatures of at least 180°C or more and chemical materials.