There is provided a Mn--Zn based ferrite member excellent in mass productivity, high in withstand voltage, low in loss and excellent in direct current superposition property. The Mn--Zn based ferrite member is provided with a surface layer portion having the properties that .rho.5 defined in the specification satisfies the relation that .rho.5.gtoreq.10.sup.3 .OMEGA.m and .rho.50 defined in the specification satisfies the relation that .rho.50.ltoreq.10.sup.2 .OMEGA.m. .rho.5: (R0-R1)S/L5 (.OMEGA.m) .rho.50: (R2-R3)S/L50 (.OMEGA.m)