To provide a cosmetic brush which enables the application of different amount of cosmetics depending on the regions in one's face or desired shades by using a different portion of the brush, and can be easily, properly, and promptly mass-produced.

This cosmetic brush (5) is fan-shaped in cross section meeting a certain requirement, which causes the irregular attachment of cosmetics to the cosmetic brush (5) when the cosmetic brush (5) is taken out of a container body (2). Therefore, the cosmetics can be properly applied with either an edge part (5a) or a round surface part (5b) according to the region to be applied or the desired shade, and the fine adjustment in shades can be made as well. Regarding its manufacturing process, as the brush fiber bundles can be precisely and swiftly cut and shaped with a double-edged blade with the minimum interference with cutting tools, the mass production can be implemented.