| abstract |
Provided is a protein adsorption inhibitor that has excellent film-forming properties and water solubility, can be easily coated on various substrates, and has excellent protein adsorption inhibitory properties. To provide a protein adsorption-preventing film used and a medical device provided with the protein adsorption-preventing film. At least a structural unit (A) represented by the following formula (1): ## STR1 ## wherein R1 represents a methyl group or an ethyl group, and n represents an integer of 1 to 10, and is further hydrophobic. A protein adsorption-preventing agent containing a group-containing polymer and an aqueous solvent, a protein adsorption-preventing membrane using the same, and a medical device provided with the protein adsorption-preventing membrane. |