| abstract |
An object is to provide a zwitterionic compound having an excellent protein adsorption inhibitory effect. The zwitterionic compound is a polymer comprising a unit represented by the following formula (1): n n n n n n n n n n wherein R 1 is a hydrogen atom or a methyl group, R 2 is OH or O − , X 1 is —O— or —N(Q 1 )-, Q 1 is a hydrogen atom or a C 1-6 alkyl group, m is an integer of 1 to 12, and n is an integer of 1 to 4. |