To solve the problem that coating liquid is not uniformly stuck, the liquid is fully held at one part but little liquid is held at the other part, and it becomes difficult to uniformly apply it to eyelashes since the length of radial brush bristles varies depending on the array degree of two kinds of brush bristles and they get uneven because of the concentration of short brush bristles at one part and the concentration of long brush bristles at one part.

In the application brush in which filaments made of a synthetic resin are bundled, the application brush has hollow filaments, and the cross-sectional shape of the base part of the filament and the cross-sectional shape of the hollow part have different shapes. A division piece is formed at a part of the filament, and the filament with the division piece is arranged partially or entirely along the longitudinal direction of the application brush.