A semi-conductive vulcanized rubber material having a predetermined shape can be produced using, as a raw material, a semi-conductive rubber composition comprising: (a) a polyether polymer which is produced by polymerizing an oxirane compound and acts as a rubber component; (b) a copper compound; and (c) an organic peroxide. The semi-conductive vulcanized rubber material has low staining properties, a low volume resistivity and low dependency of volume resistivity on the environment, and is therefore particularly useful as a material that constitutes a semi-conductive rubber roll or a semi-conductive endless rubber belt for use in a laser printer or a copying machine.