A method of manufacturing a secondary battery, using an electrode plate having an electrode mixture layer formed from an electrode mixture paste, includes performing wet preliminary kneading to knead a powder and a solvent with a stirrer, while measuring kneading torque, determining a mixing ratio of the powder to the solvent used in the wet preliminary kneading in the case where the kneading torque once increases as kneading time passes from start of kneading, reaches a peak value, and then decreases, as a desirable mixing ratio, and performing main kneading to mix and knead the powder and the solvent of the electrode mixture paste, at the mixing ratio determined as the desirable mixing ratio, at a shearing speed that does not exceed a speed of shearing a mixture of the powder and the solvent with the stirrer during the wet preliminary kneading, and producing the electrode mixture paste.