A nonaqueous electrolyte secondary battery according to the present invention comprises a positive electrode that contains, as positive electrode active materials: a lithium transition metal composite oxide (A) that is configured of secondary particles, in each of which primary particles having an average particle diameter of 0.5 μm or more aggregate, or is configured of substantially one kind of particles, while having a volume-based D50 of from 0.6 μm to 3 μm; and a lithium transition metal composite oxide (B) that is configured of secondary particles, in each of which primary particles having an average particle diameter of 0.3 μm or less aggregate, while having a volume-based D50 of from 6 μm to 25 μm.