A sheet-conveying device that conveys a sheet, the device comprising: register rollers that move to a direction which is perpendicular to a conveying direction of the sheet with the register rollers nipping the sheet, and correct a position of the sheet; a guide member that constitutes a sheet-conveying route, the guide member being provided at an upstream side of the register rollers along the conveying direction of the sheet; a plurality of rollers, each roller projecting from the guide member, contacting the sheet and rotating together with the conveyance of the sheet, and the plurality of rollers being provided at plural portions of the guide member at the upstream side of the register rollers along the conveying direction of the sheet; an elevating mechanism that elevates each roller between a position in which each roller projects from the sheet-conveying route and a position to which each roller escapes; a deviation detection sensor that detects a position of the sheet on the width direction of the sheet along the direction which is perpendicular to the conveying direction of the sheet; and a control portion that is configured to perform a sheet-position correction operation in which the register rollers move to the direction which is perpendicular to a conveying direction of the sheet based on positional information of the sheet along the width direction thereof, the positional information being detected by the deviation detection sensor, and the position of the sheet on the width direction thereof is corrected along the direction which is perpendicular to a conveying direction of the sheet, characterized in that the control portion is further configured to search among the plurality of the rollers a roller that is positioned at a position which the end surface of the sheet, moved in the sheet-position correction operation, along the width direction thereof contacts, to calculate positional information of the roller to be escaped and to control the elevating mechanism to escape the roller specified based on the positional information of the roller to be escaped from the sheet-conveying route before the sheet-position correction operation starts. register rollers that move to a direction which is perpendicular to a conveying direction of the sheet with the register rollers nipping the sheet, and correct a position of the sheet; a guide member that constitutes a sheet-conveying route, the guide member being provided at an upstream side of the register rollers along the conveying direction of the sheet; a plurality of rollers, each roller projecting from the guide member, contacting the sheet and rotating together with the conveyance of the sheet, and the plurality of rollers being provided at plural portions of the guide member at the upstream side of the register rollers along the conveying direction of the sheet; an elevating mechanism that elevates each roller between a position in which each roller projects from the sheet-conveying route and a position to which each roller escapes; a deviation detection sensor that detects a position of the sheet on the width direction of the sheet along the direction which is perpendicular to the conveying direction of the sheet; and a control portion that is configured to perform a sheet-position correction operation in which the register rollers move to the direction which is perpendicular to a conveying direction of the sheet based on positional information of the sheet along the width direction thereof, the positional information being detected by the deviation detection sensor, and the position of the sheet on the width direction thereof is corrected along the direction which is perpendicular to a conveying direction of the sheet, characterized in that the control portion is further configured to search among the plurality of the rollers a roller that is positioned at a position which the end surface of the sheet, moved in the sheet-position correction operation, along the width direction thereof contacts, to calculate positional information of the roller to be escaped and to control the elevating mechanism to escape the roller specified based on the positional information of the roller to be escaped from the sheet-conveying route before the sheet-position correction operation starts.