This invention aims at providing a nonmagnetic or feeble magnetism diamond sintered body which can be used for a magnetized product and a magnetic material. This object is achieved by a nonmagnetic or feeble magnetism diamond sintered body the magnetic susceptibility of which is not more than 3 % of that of Fe, characterized in that this sintered body comprises a high-hardness sintered body containing not less than 50 vol.% of diamond of a grain size of 0.1-100 µm, a binder phase of the diamond sintered body having a metal component selected from the group comprising ferromagnetic iron family metals, such as Ni, Co and Fe and a mixture thereof, 1-50 vol.% of binder phase of not less than one kind of feeble magnetism metal component having a magnetic susceptibility of not more than 5x10 -6 (emu/g), such as Cr, V, Cu, Si, Zn, Al, No and W being solid dissolved in the previously-mentioned metal component, whereby the magnetic moment of the diamond sintered body having a binder phase the main components of which are iron family metals is reduced by not less than 80 %.