A three-dimensional shaping method for shaping a three-dimensional shaped object using a three-dimensional shaping device comprising a shaping table having a substantially flat upper surface on which the three-dimensional shaped object is shaped, an ejection unit, a planar direction driving unit, a layering direction scanning driving unit, and a flattening unit, the method comprising the steps of: by the ejection unit, ejecting ink for three-dimensional shaping; by the planar direction driving unit, relatively moving the ejection unit with respect to the shaping table in a plane parallel to the upper surface of the shaping table; by the layering direction scanning driving unit, relatively separating the ejection unit and the shaping table from each other in a layering direction which is a direction perpendicularly intersecting the planar direction and in which the ink is layered; by the flattening unit, flattening the ejected and layered ink; and layering a plurality of layers on the shaping table before shaping the three-dimensional shaped object to form a support layer disposed between the shaping table and the three-dimensional shaped object to support the three-dimensional shaped object from the lower side; wherein the plurality of layers have a lower part side in a vertical direction of the plurality of layers, and an upper part side in the vertical direction of the plurality of layers characterized in that the lower part side of the support layer is formed only by the planar direction driving unit without bringing the flattening unit into contact with the support layer, and after forming the lower part side, the upper part side of the support layer is formed on the lower part side, using both the planar direction driving unit and the layering direction scanning driving unit while bringing the flattening unit into contact with the support layer during scanning in the planar direction, at least a few times while forming the upper part side. by the ejection unit, ejecting ink for three-dimensional shaping; by the planar direction driving unit, relatively moving the ejection unit with respect to the shaping table in a plane parallel to the upper surface of the shaping table; by the layering direction scanning driving unit, relatively separating the ejection unit and the shaping table from each other in a layering direction which is a direction perpendicularly intersecting the planar direction and in which the ink is layered; by the flattening unit, flattening the ejected and layered ink; and layering a plurality of layers on the shaping table before shaping the three-dimensional shaped object to form a support layer disposed between the shaping table and the three-dimensional shaped object to support the three-dimensional shaped object from the lower side; wherein the plurality of layers have a lower part side in a vertical direction of the plurality of layers, and an upper part side in the vertical direction of the plurality of layers characterized in that the lower part side of the support layer is formed only by the planar direction driving unit without bringing the flattening unit into contact with the support layer, and after forming the lower part side, the upper part side of the support layer is formed on the lower part side, using both the planar direction driving unit and the layering direction scanning driving unit while bringing the flattening unit into contact with the support layer during scanning in the planar direction, at least a few times while forming the upper part side.