It is well known that magnetic properties of electrical steel sheets are influenced due to mechanical stress strongly. We have been measured residual stress distribution with a X-ray stress measurement device and clarified not only the tensile and compressive stress but also the shear stress in a rotating machine core. In particular, the influence of the shear stress on the magnetic property has not been reported. We try to develop a new measurement system of vector magnetic property under the shear stress. This paper presents a mechanism to apply the shear stress and the measured vector magnetic property of a non-oriented electrical steel sheet under the shear stress. As these results, the difference of the vector magnetic property of the non-oriented electrical steel sheet was obtained according to the shear stress.