A formed material manufacturing method, comprising the steps of: forming a convex formed portion by performing at least one forming process on a surface treated metal plate; and performing ironing on the formed portion using an ironing mold after forming the formed portion, wherein the surface treated metal plate includes a surface treated layer provided on a surface of the metal plate, and a lubricating film provided on a surface of the surface treated layer, the ironing mold includes a punch that is inserted into the formed portion, and a die having a pushing hole into which the formed portion is pushed together with the punch, the pushing hole includes a shoulder portion disposed on an outer edge of an inlet of the pushing hole and constituted by a curved surface having a predetermined curvature radius, and an inner peripheral surface which extends from a radius end of the shoulder portion in a pushing direction of the formed portion, and along which an outer surface of the formed portion slides in response to relative displacement between the punch and the die, and the inner peripheral surface extends non-parallel to an outer peripheral surface of the punch, and the inner peripheral surface is provided with a clearance between the inner peripheral surface and the outer peripheral surface that corresponds to an uneven plate thickness distribution, in the pushing direction, of the formed portion prior to the ironing relative to the outer peripheral surface by providing the inner peripheral surface such that the clearance decreases in the pushing direction at an identical reduction rate of the plate thickness of the formed portion in the pushing direction prior to ironing to ensure that an amount of ironing applied to the formed portion remains constant in the pushing direction. forming a convex formed portion by performing at least one forming process on a surface treated metal plate; and performing ironing on the formed portion using an ironing mold after forming the formed portion, wherein the surface treated metal plate includes a surface treated layer provided on a surface of the metal plate, and a lubricating film provided on a surface of the surface treated layer, the ironing mold includes a punch that is inserted into the formed portion, and a die having a pushing hole into which the formed portion is pushed together with the punch, the pushing hole includes a shoulder portion disposed on an outer edge of an inlet of the pushing hole and constituted by a curved surface having a predetermined curvature radius, and an inner peripheral surface which extends from a radius end of the shoulder portion in a pushing direction of the formed portion, and along which an outer surface of the formed portion slides in response to relative displacement between the punch and the die, and the inner peripheral surface extends non-parallel to an outer peripheral surface of the punch, and the inner peripheral surface is provided with a clearance between the inner peripheral surface and the outer peripheral surface that corresponds to an uneven plate thickness distribution, in the pushing direction, of the formed portion prior to the ironing relative to the outer peripheral surface by providing the inner peripheral surface such that the clearance decreases in the pushing direction at an identical reduction rate of the plate thickness of the formed portion in the pushing direction prior to ironing to ensure that an amount of ironing applied to the formed portion remains constant in the pushing direction.