To provide a manufacturing method of a battery plate, by which foreign materials and sharp, minute projections on the film surface of a electrode member are eliminated and the re-adhesion of the eliminated foreign materials are prevented, so that the occurrence of an failure of inner-short circuit in a battery can be reduced.

On a supporting body, a continuously fed, band-shaped electrode member runs in contact with a polishing tape having abrasive grain layers, so that the film surface of the electrode member is cleaned up.