In this research, the structural, physical and electrical characteristics of Ni-Fe core chosen tominimize the errors of the Hall current sensors were investigated and Hall current sensor using Ni-Fecore was fabricated. In the result, the fabricated Ni-Fe sample exhibited the maximum hardness about29.5 GPa and the low friction coefficient about 0.35, and electrical resistivity over 90 mOhm·cm. And alsoHall current sensor using the fabricated Ni-Fe core showed linear current-voltage properties for DCcurrent at 25℃ temperature.