Disclosed is a device including a substrate and a gel layer made of a hydrophilic polymer having a hydroxyl group, wherein the gel layer is fixed to at least a part on a surface of the substrate in a thickness of 1 nm to 3,000 nm and an elastic modulus of a device surface is 6.00 × 103 Pa or less. The present invention provides a device in which a surface of a substrate is hydrophilized by a simple treatment in a cost-effective manner.
