One of the purposes of the present invention is to provide a polysiloxane which has polymerizable groups at both terminals, is very compatible with another hydrophilic monomer, and provides a (co)polymer having improved durability of mechanical strengths. Further, the present invention provides a method for preparing the silicone of formula (1).本發明的目的在於提供一種矽酮、聚合物、眼科器件及矽酮的製造方法，其為在兩末端具有聚合性的基團的聚矽氧烷，與其他親水性單體的相容性良好，且形成機械強度的耐久性得到提高的(共)聚合物。本發明提供下述式（1）所表示的矽酮及其製造方法。
