A vehicle roll control system, comprising a front torsion bar, attached to the front hydraulic actuator and a rear torsion bar attached to the rear hydraulic actuator. The opening is surrounded by an inner border of the base. Conductive circuit patterns are provided outside of a chip mounting region of the substrate, and conductive transfer patterns are provided proximate to the chip mounting region. The elastic member, configured to restore the mold core to its previous position, is disposed between the mold plate and the mold core. The photo detector and the first and second optical function integrate substrates are laminated in the substrate thickness direction, a first optical wavelength filter and a reflecting film having different wavelength transmissivities to the propagation light are provided in an optical path between the first and second tilted surfaces. A hydrogel formed by cross-linking the present monomer and a method for making the monomer.