Disclosed is a fixing roller which comprises a core 16, a porous material layer 22 disposed in surrounding relation to an outer peripheral surface of the core 16, and a thin-walled metal sleeve 26 covering an outer peripheral surface of the porous material layer 22. The porous material layer 22 comprises a closed cell-type silicone elastomer. The present invention provides a fixing roller capable of ensuring enhanced durability and maintaining a usable state over long periods under the condition of being actually driven and rotated.