To prevent an ink from being scattered from a water supply roller end.

A metering roller 10 has a body 11, and ends 12, 13. The body 11 is formed of Rilsan(R). And, the ends 12, 13 are formed of a stainless steel. Since the Rilsan is lipophilic, a dampening water of an emulsified state (dampening water mixed with an ink) is adhered to an outer periphery 11G of the body. However, since the stainless steel is hydrophilic and oleophobic, the ink of the emulsified state is not adhered to end outer peripheries 12G, 13G. Therefore, the emulsified ink stored at the end of the roller 10 is prevented from being scattered.