Disclosed is a high refractive index material having a high refractive index, which enables the formation of a waveguide by a simpler method. Also disclosed are a high refractive index member made from the high refractive index material, and an image sensor. The high refractive index material contains a resin (A) having a structural unit represented by the following general formula (a-1) [In the formula, R1 is a hydrocarbon group, R2 is a hydrogen atom or a hydrocarbon group, and m is an integer of 0 or 1.].