A medical device with an internal wetting agent and a copolymer of silicone monomers and meeting the following requirements； (1) The internal wetting agent includes a copolymer of chain compounds having acidic groups and amide groups； (2) ) The internal wetting agent is contained in the range of 0.1-10% by mass relative to the entire medical device； (3) The copolymer of the polysiloxane monomer has a hydroxyl group, and the hydroxyl group in the polysiloxane monomer contains The ratio is in the range of 0.0005 to 0.01 equivalent/g. A medical device containing an internal wetting agent with excellent transparency and hydrophilicity can be obtained.一種具有內部濕潤劑、及聚矽氧單體之共聚物，並且滿足下述要件之醫療裝置；(1)前述內部濕潤劑包含具有酸性基與醯胺基之鏈式化合物之共聚物；(2)相對於醫療裝置整體，在0.1～10質量%之範圍內包含前述內部濕潤劑；(3)前述聚矽氧單體之共聚物具有羥基，且前述聚矽氧單體中的前述羥基之含有比率在0.0005～0.01當量/g之範圍內。可得到透明性與親水性優異之包含內部濕潤劑之醫療裝置。
