The present invention relates to Li-Ni composite oxide particles for a non-aqueous electrolyte secondary battery which have a large charge/discharge capacity and are excellent in thermal stability under a charged condition. The above object can be achieved by the Li-Ni composite oxide particles for a non-aqueous electrolyte secondary battery, comprising a Li-Ni composite oxide whose secondary particles form core particles thereof and have a composition represented by the formula: Li x1 Ni 1-y1-z1-w1 Co y1 Mn z1 M w1 O 2 (in which 0.9 <= x1 <= 1.3; 0.1 <= y1 <= 0.3; 0.0 <= z1 <= 0.3; 0 <= w1 <= 0.1; and M is at least one metal selected from the group consisting of Al and Fe), wherein a Li-Ni composite oxide having a composition represented by the formula: Li x2 Ni 1-y2-z2-w2 Co y2 Mn z2 M w2 O 2 (in which 0.9 <= x2 <= 1 + z2; 0 <= y2 <= 0.33; 0 <= z2 <= 0.5; 0 <= w2 <= 0.1; and M is at least one metal selected from the group consisting of Al, Fe, Mg, Zr and Ti, is coated or present on a surface of the respective secondary particles.