Powder-material supply device for three-dimensional molding device

Provided is a powder-material supply device which makes it possible to form a powder-material layer in which the density of the powder material therein is increased to the maximum possible, in a three-dimensional molding device for producing three-dimensional molded articles from a powder material. To this end, a flattening member for adjusting the thickness of a layer of a powder material supplied onto a table to a prescribed layer thickness while flattening the upper surface of the powder-material layer is configured so as to: adjust the thickness of the powder-material layer while downwardly pressing the powder-material layer to be flattened in concert with the movement of the powder-material supply device; and flatten the upper surface of the powder-material layer.