An alkaline battery includes a positive electrode including a positive electrode active material, a negative electrode including a negative electrode active material, and an alkaline electrolyte including potassium hydroxide. The positive electrode active material includes a manganese dioxide powder, and the negative electrode active material includes a zinc powder. In a powder X-ray diffraction pattern of the manganese dioxide powder using CuKα radiation, the diffraction peak attributed to the (110) plane is in the range of 20.5° to 21.7°, and the ratio of the peak intensity of the (130) plane to the peak intensity of the (021) plane: I(130)/I(021) is 0.1 or less.