A toner supply roller (1) is produced by preparing a rubber composition which contains a rubber component including an epichlorohydrin rubber and a butadiene rubber, a crosslinking component and a foaming component and, while extruding the rubber composition into a tubular body, continuously foaming and crosslinking the rubber composition of the tubular body by a continuous crosslinking apparatus including a microwave crosslinking device and a hot air crosslinking device. An image forming apparatus incorporates the toner supply roller (1).