To provide a polishing brush and a polishing device for a disc-like substrate capable of performing polishing work stably and efficiently with high precision, and to provide a manufacturing method for the disc-like substrate.

This polishing brush 150 is formed by winding rows 152 of brushes around a shaft core 151 spirally and fixing them. The row 152 of brushes is formed by folding a brush hair material 154 into two sections in its central part to wind a core metal unit 155, caulking a bent part for winding the core metal unit 155 from an outer side by a basic part fitting 156 as a brush basic material, and fixing it to the core metal unit 155 integrally. Hair tips on both sides of the brush hair material 154 are mutually abutted and lean against each other, and hair tips of many brush hair materials 154 on both sides are collected in the peripheral direction of the core metal unit 155.