A cosmetic-containing applicator. The applicator is mounted, at its tip end, with an applicator body in which a flange-shaped engagement part is formed at an outer periphery at a rear end of a fiber bundle, comprising an accommodating part accommodating liquid cosmetics, a tip casing mounted on a tip end side of the accommodating part and formed with an insertion hole in which the applicator body (30) is mountable, a guiding part for guiding the cosmetics from the accommodating part to the applicator body, and a reduced-diameter part formed as an inwardly facing flange and reducing in diameter between the insertion hole and the guiding part. The reduced-diameter part is divided into claw-shaped holding pieces by slits, and its smallest-diameter part has a diameter smaller than an outer diameter of the engagement part.