A roll-press apparatus , comprising: a pair of upper and lower press-rolls for pressing an electrode plate fed from a supply coiler to a take-up coiler , wherein the electrode plate has a coated part coated with an active material applied on a metal foil and an uncoated part not coated with the active material; and a wrinkling prevention device , wherein the wrinkling prevention device comprises: a work roll having a diameter smaller than the other press-rolls ; a backup roll to reinforce the work roll ; and a work roll parallelism holding means for keeping the parallelism of the work roll with respect to the corresponding press-roll , wherein the work roll parallelism holding means comprises: a frame for holding the work roll ; and a plurality of members provided on the frame , wherein each of which members contacts severally at two points on the press-roll on a side where the work roll does not contact, wherein the pair of the upper and the lower press-rolls is adapted to perform roll pressing the coated part , and one press-roll in the paired two press-rolls and the small diameter work roll are adapted to perform roll-pressing the uncoated part . a pair of upper and lower press-rolls for pressing an electrode plate fed from a supply coiler to a take-up coiler , wherein the electrode plate has a coated part coated with an active material applied on a metal foil and an uncoated part not coated with the active material; and a wrinkling prevention device , wherein the wrinkling prevention device comprises: a work roll having a diameter smaller than the other press-rolls ; a backup roll to reinforce the work roll ; and a work roll parallelism holding means for keeping the parallelism of the work roll with respect to the corresponding press-roll , wherein the work roll parallelism holding means comprises: a frame for holding the work roll ; and a plurality of members provided on the frame , wherein each of which members contacts severally at two points on the press-roll on a side where the work roll does not contact, wherein the pair of the upper and the lower press-rolls is adapted to perform roll pressing the coated part , and one press-roll in the paired two press-rolls and the small diameter work roll are adapted to perform roll-pressing the uncoated part . a work roll having a diameter smaller than the other press-rolls ; a backup roll to reinforce the work roll ; and a work roll parallelism holding means for keeping the parallelism of the work roll with respect to the corresponding press-roll , wherein the work roll parallelism holding means comprises: a frame for holding the work roll ; and a plurality of members provided on the frame , wherein each of which members contacts severally at two points on the press-roll on a side where the work roll does not contact, wherein the pair of the upper and the lower press-rolls is adapted to perform roll pressing the coated part , and one press-roll in the paired two press-rolls and the small diameter work roll are adapted to perform roll-pressing the uncoated part . a frame for holding the work roll ; and a plurality of members provided on the frame , wherein each of which members contacts severally at two points on the press-roll on a side where the work roll does not contact, wherein the pair of the upper and the lower press-rolls is adapted to perform roll pressing the coated part , and one press-roll in the paired two press-rolls and the small diameter work roll are adapted to perform roll-pressing the uncoated part . <EOS>