PURPOSE: To manufacture continuously a hollow bearing material having an oil groove simply and inexpensively by providing claws projecting to the inside of the cavity on the outer mold or core of a mold for continuous casting, and drawing the billet having hardened surface while rotating it in the circumferential direction.

CONSTITUTION: A mold 3 for continuous casting consisting of an outer mold 1 having a gate 8 and a core 2 attached thereto to arrest relative rotation is mounted to the bottom of a furnace 4 to arrest the relative rotation. One or more claws 13 projecting to the inside of the cavity are formed on the small diameter part of the core 2. Molten metal 16 is sent into the cavity of the mold 3 from the gate 8. A hollow bearing material 17 having an oil groove is grasped by a chuck 15 while jetting cooling water from nozzles 14 thereunder, and drawn while oscillating and rotating by a specified angle in the circumferential direction. Then, a nearly 8-shaped oil groove 18 can be formed on the inner peripheral face. When it is drawn while rotating in one direction in the circumferential direction, the oil groove 18 is formed spirally. When the said calws 13 are provided on the outer mold 1 side, the oil groove 18 is formed on the outer peripheral face of the material 17.