A method of manufacturing a powder magnetic core includes: a step of manufacturing a soft magnetic powder and an oxide powder and producing a mixed powder of the soft magnetic powder and the oxide powder as a raw material powder, the soft magnetic powder containing soft magnetic composite particles containing pure iron and Fe-α -Alloy containing an element α which is more oxidizable than Fe, the soft magnetic composite particles each having a core-sheathing structure in which one core is made of pure iron or the Fe-α alloy and a sheathing of the other The oxide powder contains oxide particles which can be selected from at least Fe and an element β which forms an oxide with a higher electrical resistance than FeO; a step of compacting the mixed powder into a green compact; and a step of sintering the green compact at 900 ° C or more and 1300 ° C or less.
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