Provided are a silicon oxide-coated zinc oxide, a silicon oxide-coated zinc oxide-containing composition, and a cosmetic that can suppress a decrease in viscosity caused by a carbomer when applied to an aqueous material. The silicon oxide-coated zinc oxide of the invention is a silicon oxide-coated zinc oxide containing zinc oxide particles and a silicon oxide film on the surface of the zinc oxide particles, and has a suspended water conductivity of 120 μS / cm or less.水系材料に適用した場合、カルボマーに起因する粘度の低下を抑制できる酸化ケイ素被覆酸化亜鉛、酸化ケイ素被覆酸化亜鉛含有組成物及び化粧料を提供する。発明の酸化ケイ素被覆酸化亜鉛は、酸化亜鉛粒子と、前記酸化亜鉛粒子の表面における酸化ケイ素被膜と、を含む酸化ケイ素被覆酸化亜鉛であって、懸濁水導電率が120μS/cm以下である。