Patent ID: 8231433

Claim:
A polishing method of a disk-shaped substrate for polishing an edge face of a disk-shaped substrate using polishing liquid, comprising in this sequence: a first polishing process for polishing the edge face using a first brush made of a resin in which polishing abrasive grains are included; and a second polishing process for polishing the edge face using a second brush made of a resin in which the polishing abrasive grains are not included, wherein in the first polishing process and the second polishing process, the disk-shaped substrates are piled so that the outer circumferential edge faces of the piled disk-shaped substrates are opposed to the first or second brush, and a side wall portion and a chamfered portion provided on the outer circumferential edge face are polished at the same time, and in the first polishing process, the piled disk-shaped substrates are opposed to the first brush and polished, and the piled disk-shaped substrates are inverted, opposed to the first brush and polished.