To provide a flattening layer forming device advantageous in terms of flattening accuracy and productivity.SOLUTION: Disclosed is a flattening layer forming device for forming a flattening layer with a flattening material on a substrate using a pressing member. The pressing member has a width wider than the substrate, and is provided in a form of a roll around which the pressing member is wound. The flattering layer forming device includes: a first spool and a second spool which are arranged opposite to each other so as to sandwich a substrate holding part in a plan view in a space on the substrate holding part; and a feeding part for winding the pressing member fed from the roll mounted on the first spoon by the second spool. The device brings the pressing member into contact with the flattering material on the substrate by reducing the tension of the pressing member between the first spool and the second spool and makes the pressing member separated from the flattening material by increasing the tension.SELECTED DRAWING: Figure 1
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