POSITIVE ELECTRODE ACTIVE MATERIAL FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERIES, AND NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

This positive electrode active material for nonaqueous electrolyte secondary batteries comprises an Ni-containing lithium composite oxide A and an Ni-containing lithium composite oxide B. Each of the Ni-containing lithium composite oxide A and the Ni-containing lithium composite oxide B contains 50% by mole or more of Ni relative to the total number of moles of the metal elements excluding Li; the Ni-containing lithium composite oxide A has an average primary particle diameter of 2 µm or more, an average secondary particle diameter of from 2 µm to 6 µm, and a particle breaking load of 5 mN or more; and the Ni-containing lithium composite oxide B has an average primary particle diameter of 1 µm or less, an average secondary particle diameter of from 10 µm to 20 µm, and a particle breaking load of 20 mN or more, while having a coating layer on the surface of each primary particle.