PROBLEM TO BE SOLVED: To provide a method for modifying a DLC film, allowing improvement of a hydrophilic property of the DLC film and allowing efficient impartment of a function of biocompatibility or the like.SOLUTION: This superhydrophilic material includes a substrate, and the DLC film formed on the surface of the substrate and having hydrophilic functional groups. The contact angle of water on the surface of the DLC film is 10 degrees or below, and an intermediate layer improving adhesion between the substrate and the DLC film is formed between the substrate and the DLC film. The thickness of the DLC film is 0.01 &mum or above and 3 &mum or below, and the thickness of the intermediate layer is 0.01 &mum or above and 0.3 &mum or below.
