The present invention provides a glycerin-modified silicone which has an excellent emulsification/dispersion performance and thickening effect when used alone, particularly when the oil phase is a continuous phase.The present invention is a specific diglycerin derivative-modified silicone having a long-chain hydrocarbon group at a prescribed ratio in a molecule and having as a hydrophilic group only a diglycerin derivative group not having an oxyalkylene structure with an average value of the number of repetitions of oxyalkylene units of two or more； and a composition containing the diglycerin derivative-modified silicone.
