Abstract: The present disclosure relates to a positive electrode comprising a positive electrode active material layer and a positive electrode base material, wherein the positive electrode active material layer includes a positive electrode active material, the positive electrode active material includes a layered metal oxide, the ratio of nickel to the total amount of nickel and a transition metal in the layered metal oxide is 70% or more, and the positive electrode active material present near a surface of the positive electrode active material layer closer to the positive electrode base material has a crystallite diameter that is 200 Å to 500 Å greater than the positive electrode active material present near a surface of the positive electrode active material layer opposite to the positive electrode base material. According to the present disclosure, a positive electrode and a battery each of which is excellent in both endurance and efficiency are provided.