a technique having superior efficiency for manufacturing a bevel gear forging die is presented . in the present invention , raw material is machined by means of a radius end mill , manufacturing a bevel gear forging die 10 . in recent years , it has become possible to use radius end mills to form complex shapes from raw materials having a high degree of hardness , owing to the fact that nc construction devices and their controlling programs control the deployment of radius end mills , and due to the improved accuracy of the radius end mill itself . by improving the process path of the radius end mill , the inventors have succeeded in creating a process whereby a radius end mill can be used to cut a bevel gear forging die 10 having a side face , a base face , and a diagonal face .