The dust core comprises a plurality of soft magnetic iron-based particles, a coating layer disposed on each of the surfaces of the soft magnetic iron-based particles, an interstitial layer disposed between the coating layers, and a nanopowder disposed between the soft magnetic iron-based particles. The coating layer is a layer of a compound comprising Fe, Si, O, B and N; and the nanopowder is a powder of a compound comprising O, N and at least one element selected from the group consisting of Fe, Si, Zr, Co, Al, Mg, Mn and Ni.