Surface modification method and surface modifying material

Disclosed is to provide a surface modified material surface by surface modification method and surface modification method capable of introducing at high density a phosphorylcholine group on the surface of the material is modified for the purpose. A surface modification method, the material having a functional group or a silanol group capable of forming a silanol group by hydrolysis to the surface, the general formula (Wherein, R In a compound represented by the step of applying a coating solution containing a hydrophilizing agent having a functional group or a silanol group capable of forming a silanol group by hydrolysis. .BACKGROUND