Abstract: A forging device and a method therefor that enables to improve forging precision of a work and lengthen life of dies of a forging device, by efficiently heating the work chiefly made of aluminum in one heating furnace, wherein the device has: a heating furnace for heating works W while moving the works W along the movement path; an intermediate processing means, disposed in the midst of the movement path in a heating furnace, for intermediately forming works W; an intermediate conveyance means for conveying works W from the heating furnace to the intermediate processing means; and a final processing means for making the intermediate conveyance means convey the intermediately formed works W to the heating furnace, reheating the conveyed the works W, and finally processing to form the works W.