The method comprises: a compression step whereby a band-shaped electrode sheet having an active substance layer, which is an active substance forming portion, is passed between at least a pair of rotating cylindrical compression rolls, and the electrode sheet is pressed to be compressed by the pair of compression rolls; and a cutting step whereby the electrode sheet that underwent the compressionstep is cut parallel to the length direction of this electrode sheet. With the width of the active substance layer being a first width, the compression step compresses the electrode sheet using compression rolls having a second width that is narrower than the first width.