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A solid electrolyte including a layered metal oxide represented by the formula (1),
[in-line-formulae](La1-xAx)(Sr1-yBy)3(Co1-zCz)3O10-δ (1)[/in-line-formulae]
[wherein A represents a rare earth element other than La; B represents Mg, Ca, or Ba; C represents Ti, V, Cr, or Mn; 0≦x≦1, 0≦y≦1, 0≦z<1; and δ represents an oxygen deficiency amount].