Abstract: This invention relates to a double facer of a corrugating machine which aims to improve a drying state or bonding state between a single-faced corrugated fiberboard sheet and a liner and improve the quality of a corrugated fiberboard sheet. In a double facer for bonding together a single-faced corrugated fiberboard sheet and a liner to form a corrugated fiberboard sheet, provided are a heating member disposed along a conveying direction of the corrugated fiberboard sheet; a pressing unit, disposed so as to oppose the heating member, for pushing the corrugated fiberboard sheet against the heating member; a sheet conveying unit, disposed downstream the heating member, for conveying the corrugated fiberboard sheet; and a sheet feeding unit for feeding the corrugated fiberboard sheet toward the sheet conveying unit; while the pressing unit comprises a plurality of pressing devices disposed in series as being separated from each other along the conveying direction of the corrugated fiberboard sheet.