The present invention is a method of manufacturing an eye lens material having a process in which a phosphorylcholine group-containing chemical compound represented by the following formula (1) is reacted and covalently bonded onto the surface of an eye lens material wherein a chemical compound having an end amino group is introduced to said eye lens material and then the chemical compound represented by the following formula (2) or (3) is introduced through said chemical compound having an end amino group. The object of the present invention is to provide a method of manufacturing a contact lens that prevents protein adsorption. n denotes a natural number 1-18.