PROBLEM TO BE SOLVED: To provide surface-treated powder having excellent adhesiveness during application of cosmetics, good slip and spread, and affording a natural finish feeling and to provide the cosmetics.SOLUTION: There are provided the surface-treated powder having cleavability, and the cosmetic including the surface-treated powder by using a layered polysilicic acid and/or a salt thereof as a substrate, and coating the surface thereof with an organic substance.COPYRIGHT: (C)2011,JPO&INPIT【課題】化粧料塗布時の密着性に優れ、伸び広がりが良好で、自然な仕上がり感となる表面処理粉体及び化粧料を提供する。【解決手段】層状ポリケイ酸および/またはその塩を基材とし、有機物にて表面を被覆することにより、へキ開性を有した表面処理粉体および該表面処理粉体を含む化粧料を提供する。【選択図】なし