In order to achieve lightness and improve hardness of a brake disk, and minimize weight and improve productivity through an improvement of a coupling structure of a disk plate and a hub, provided is a method of manufacturing a brake disk including a disk plate, which provides a friction surface and is formed with a hole at a center, and a hub, which is coupled to the hole formed at the center of the disk plate, the method including: preparing a disk plate; preparing a hub in the form of a flat plate; positioning the hub in the form of the flat plate on one surface of the disk plate; and bonding the disk plate and the hub by an interference fit.