A horizontal two-axis diffractometer for glasses and liquids, installed at SPring-8 bending magnet beamline BL04B2, operated at 8GeV electron energy, is described. Photon energies of 37.8 and 61.7keV were obtained using a bent Si (111) crystal and a bent Si (220) crystal, respectively. The instrument has been successfully applied to measure diffraction spectra of vitreous SiO 2 in transmission geometry up to scattering vector Q=36Å - 1 , and measured total structure factor S(Q) was well reproduced by reverse Monte Carlo modelling.