Substrate for a biochip using the medical material for the polymer compound and the polymer compound

The present invention is excellent in fixing ability of the physiologically active substance has a low chemical and physical stability of dissolution or degradation in the washing step, particularly suitably coated medical polymer compound to a plastic substrate surface a main object of the present invention to provide a. The present invention is, at least, a polymer containing repeating units derived from ethylenically unsaturated polymerizable monomers (a) having a functional group for immobilizing a physiologically active substance, at least one end of the polymer medical materials for polymer compounds characterized by having a reactive functional group, and a biochip substrate for a layer formed on the substrate surface including the polymer compound, the above-mentioned problems are eliminated.