A positive electrode material has a P63MC crystal system structure. In an XRD pattern of the positive electrode material, peaks are present respectively at 2θ of 17.6±0.3°, 37.3±0.3°, 40.6±0.3°, and 45.2±0.3°, where the peak at 17.6±0.2° is a (002) peak, the peak at 37.3±0.3° is a (101) peak, the peak at 40.6±0.3° is a (102) peak, and the peak at 45.2±0.3° is a (103) peak, where a ratio of a peak intensity of the (101) peak to a peak intensity of the (002) peak is 0.04 to 0.4, and a ratio of the peak intensity of the (101) peak to a peak intensity of the (103) peak is 0.4 to 3.0.