To provide a method for manufacturing a brake disk having an outer peripheral shape with radial projections and recesses formed repeatedly in the circumferential direction, the process having superior productivity wherein a curved face section can be formed uniformly over the entire perimeter of each outer peripheral edge of the disk body and no chamfering step is required for deburring.

In this process, a disk body 1 having an outer peripheral shape with repeatedly formed projections and recesses is half-blanked from one surface of a sheet material W in the thickness direction thereof, and thereafter the disk body 1 is blanked from the other surface of the sheet material W in the thickness direction thereof. Thus, curved face sections 1b, 1d created by rollover and contiguous to sheared face sections 1a, 1c on the outer peripheral surface of the disk body 1 are formed on the respective outer peripheral edge parts of the respective side faces on one side and the other side in the thickness direction of the disk body 1 manufactured according to the process. The inner diameter R11 of a die 11 used in the half-blanking process is set smaller than the outer diameter R12 of a punch 12.