Billets 3 are fed to billet carrying equipment 2 through billet loading equipment 28. With actuation of a first truing-up equipment the grinding apparatus of billets at both end faces 1, the billet placed on a tray 23 is trued-up to the side of a first grinding equipment for working on planar portions 4A. With actuation of the first grinding equipment for working on planar portions 4A, working on the planar portion in one end face of the billet 3 is performed by a grinding belt 46. The billet is carried through billet carrying equipment 2 to the position of working of a first grinding equipment for chamfering 5A. With actuation of a second truing-up equipment, a truing-up guide is pushed to cause the billet on the tray 23 is trued-up to the side of first grinding equipment for chamfering 5A.