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The tensile strain dependence of the upper critical field Bc2 for Nb3Sn wires was measured using a new apparatus for applying tension at low temperature. The critical current Ic calculated from the strain-dependent Bc2 measurements is the almost consistent with the measured Ic. In the measurements by a new apparatus, the axial and the lateral applied strains were examined by the strain gauges attached onto the wire. The deviatoric strain epsivdev and the hydrostatic strain epsivhyd were estimated by the axial and the lateral strain. We found the deviatoric strain dependence of Bc2 is different between the tensile and compressive strain states. This means that the hydrostatic strain also should be taken into account in order to understand the strain effects on the superconducting properties of Nb3Sn.