A cathode mixture, a non-aqueous electrolyte secondary battery, and manufacture method thereof are provided. The cathode mixture for a non-aqueous electrolyte secondary battery includes: a cathode active material having an olivine type crystal structure; and an inorganic oxide which does not contribute to charge and discharge. A particle diameter A of the cathode active material lies within a range from 0.1 μm or more to 0.5 μm or less. There is a relation of A>B between the particle diameter A of the cathode active material and a particle diameter B of the inorganic oxide.