A powder for use in a cosmetic is provided. Said powder is highly water-repellent feels smooth, light, and moisturizing and adheres well to the skin. The use of said powder in a cosmetic provides said cosmetic with a pleasant feel excellent, long-lasting efficacy and superb temporal stability. The present invention is a powder for use in a cosmetic, said powder having been surface-treated by a silicone gel. Surface-treating said powder with a silicone gel makes the powder highly water-repellent produces a smooth, light feel provides the moisturizing feel characteristic of silicone gels and makes the powder adhere well to the skin. This powder is preferably either an inorganic powder, an organic powder, or a compound powder consisting of an inorganic powder and an organic powder. Furthermore, the aforementioned silicone gel is preferably obtained by performing a hydrolytic condensation reaction on the diorganopolysiloxane represented by formula (1), both ends of which are reactive, and an organopolysiloxane cross-linker containing one or both of the following: the silane coupling agent represented by formula (2), which has two or more hydrolyzable groups per molecule and the reactive organopolysiloxane represented by formula (3).Linvention concerne une poudre pour lutilisation dans un produit cosmétique. Ladite poudre est hautement hydrofuge est perçue comme lisse, légère et hydratante et adhère bien à la peau. Lutilisation de ladite poudre dans un produit cosmétique fournit un produit cosmétique ayant un toucher agréable une excellente efficacité prolongée et une superbe stabilité temporelle. La présente invention est une poudre pour lutilisation dans un produit cosmétique, ladite poudre ayant été traitée en surface par un gel de silicone. Le traitement en surface de ladite poudre par un gel de silicone rend la poudre hautement hydrofuge produit un toucher lisse, léger fournit la caractéristique de sensation dhydratation des gels de silicone et fait que la poudre ad
