The elastic moduli of polycrystalline wadsleyite, ¿-(Mg0.91Fe0.09)2SiO4, were measured up to 470 K by means of the resonant sphere technique. The adiabatic bulk (KS) and shear (¿) moduli were found to be 165.72(6) and 105.43(2) GPa at room temperature. The average slopes (dKS/dT and d¿/dT) in the range were determined to be -0.0175(3) and -0.0159(1) GPa/K. We estimated that the P-, S-wave velocity and density jumps for the α- to ¿-phase transformation at the 410-km depth condition were 9.5, 11.2 and 5.4%, respectively. These results suggest that the olivine component at the depth should be 52 and 42 volume % for P- and S-waves.