A roll-press apparatus, comprising: a pair of upper and lower press-rolls (101, 102) 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 (101, 102); 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 (101, 102), wherein the work roll parallelism holding means comprises: a frame (204, 207) for holding the work roll; and a plurality of members provided on the frame (204, 207), wherein each of which members contacts severally at two points on the press-roll (101, 102) on a side where the work roll does not contact, wherein the pair of the upper and the lower press-rolls (101, 102) is adapted to perform roll pressing the coated part, and one press-roll in the paired two press-rolls (101, 102) and the small diameter work roll are adapted to perform roll-pressing the uncoated part. a pair of upper and lower press-rolls (101, 102) 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 (101, 102); 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 (101, 102), wherein the work roll parallelism holding means comprises: a frame (204, 207) for holding the work roll; and a plurality of members provided on the frame (204, 207), wherein each of which members contacts severally at two points on the press-roll (101, 102) on a side where the work roll does not contact, wherein the pair of the upper and the lower press-rolls (101, 102) is adapted to perform roll pressing the coated part, and one press-roll in the paired two press-rolls (101, 102) 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 (101, 102); 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 (101, 102), wherein the work roll parallelism holding means comprises: a frame (204, 207) for holding the work roll; and a plurality of members provided on the frame (204, 207), wherein each of which members contacts severally at two points on the press-roll (101, 102) on a side where the work roll does not contact, wherein the pair of the upper and the lower press-rolls (101, 102) is adapted to perform roll pressing the coated part, and one press-roll in the paired two press-rolls (101, 102) and the small diameter work roll are adapted to perform roll-pressing the uncoated part. a frame (204, 207) for holding the work roll; and a plurality of members provided on the frame (204, 207), wherein each of which members contacts severally at two points on the press-roll (101, 102) on a side where the work roll does not contact, wherein the pair of the upper and the lower press-rolls (101, 102) is adapted to perform roll pressing the coated part, and one press-roll in the paired two press-rolls (101, 102) and the small diameter work roll are adapted to perform roll-pressing the uncoated part.