To provide a low-priced device using an inexpensive backup roll in the device that can easily impart irregularities using nearby stock materials.

The roll surface is composed of outer peripheral portions of several round plates stacked, and in the device for imparting the irregularities which processes a sheet-like object through the sheet-like object between rolls 1, 2 where the round plate having the irregularities in the outer periphery and the round plate having no irregularities are mixed, there are round plates 28, 110 having no irregularities having no function to impart the irregularities to the sheet-like object, and then, slides of both round plates are prevented and backed up by the round plate 51 provided in the backup roll, and the roll backed up by the backup roll 50 is deformed to meet the deformative state of the other opposing roll and an even roll working is allowed over the total width surface of the sheet-like object.