A nonaqueous electrolyte battery includes a positive electrode, a negative electrode and a nonaqueous electrolyte. The positive electrode contains active material particles and a coating material. The active material particles are represented by any one of the following formulae (1) to (3): LixM1yO2  (1) LizM22wO4  (2) LisM3tPO4  (3) and have an average particle diameter of 0.1 to 10 μm. The coating material comprises at least particles having an average particle diameter of 60 nm or less or layers having an average thickness of 60 nm or less. The particles or the layers contain at least one element selected from the group consisting of Mg, Ti, Zr, Ba, B and C.