Nail-care composition containing nail-care polymer

A nail-care composition comprising a nail-care polymer of a weight average molecular weight of 30,000 to 1,500,000, comprising 0.5 to 90% by weight of a unit derived from polysiloxane compound A represented by the following formula (1):

• wherein
• D and D′ each independently represent an unsaturated bond-containing group represented by the following formula (2) or (3):
• R1 and R3 may be the same or different and represent hydrogen atom, an alkyl group with one to 10 carbon atoms, aryl group, or a polyoxyalkylene group with the end substituted with hydroxyl group, alkoxyl group or alkylcarbonyloxy group;
• R2 represents hydrogen atom or methyl group;
• X represents amino group or oxygen atom;
• n represents an integer of 4 to 500;
• p represents an integer of 1 to 4;
• q represents an integer of 0 to 4;
• and m represents an integer of 0 to 4;
• and 10 to 99.5% by weight of a unit derived from radical polymerizable monomer B, which is copolymerizable with the Compound A
• wherein the radical polymerizable monomer B comprises hydrophobic unsaturated monomer B2 or a mixture comprising hydrophilic unsaturated monomer B1 and hydrophobic unsaturated monomer B2.