An oxide magnetic material includes a ferrite with a hexagonal structure as its main phase. Metallic elements included in the oxide magnetic material are represented by the formula: Ca1-x-x′LaxSrx′Fe2n-yCoy, where atomic ratios x, x′ and y and a molar ratio n satisfy 0.4≦x≦0.6, 0.01≦x′≦0.3, 0.2≦y≦0.45 and 5.2≦n≦5.8, respectively.