To provide a forging method of a hard-to-work ring in which surface cracks are hardly generated in a corner part, etc., of an inside diameter surface during the hole expansion or hole expansion shaping in forging the hard-to-work ring 1.

In this forging method of the hard-to-work ring, a dummy ring 2 is inserted in the inside diameter surface of the hard-to-work ring 1, and hole expansion or hole expansion shaping is performed after simultaneously heating both the dummy ring and the hard-to-work ring.