A manufacturing device for a drive plate that manufactures a drive plate including a plate portion that transfers a drive force of an engine to a transmission and a ring gear portion provided at an outer periphery of the plate portion to be meshed with a gear of a starter motor, the device comprising: a compression punch adapted to compress a side wall portion of a workpiece in an axial direction, the workpiece including a bottom surface portion and the side wall portion which is cylindrical and provided to extend upright from an outer peripheral end portion of the bottom surface portion; a compression die disposed to face the compression punch in the axial direction and having a toothed shape formed on an inner peripheral surface of the compression die; and dies adapted to restrain the bottom surface portion, namely: a first restraint punch, a second restraint punch that is disposed at a position at which it faces the first restraint punch, characterised by a third restraint punch that is disposed outward of the first restraint punch; wherein the side wall portion is disposed inward of the inner peripheral surface of the compression die; the compression punch is adapted to contact the compression die, and to push the compression die thereafter such that both the compression die and the compression punch relatively move in the axial direction with respect to the workpiece that is restrained by the first restraint punch, the second restraint punch and the third restraint punch; both the compression die and the compression punch are adapted to move in the axial direction even after the compression punch contacts the compression die and the side wall portion is bulged to tightly contact the compression die; and a toothed shape is formed on the side wall portion to form the ring gear portion by thickening a preliminary side wall portion; wherein the first restraint punch comprises a projection portion, a first distal-end face and a second distal-end face for contacting the workpiece, wherein the second restraint punch comprises a first distal-end surface and a second distal-end surface facing the first restraint punch and having an outer peripheral facing surface and a toothed shape formed on an outer peripheral surface, and wherein the third restraint punch being disposed outward of the first restraint punch, comprises a distal-end face facing the second restraint punch, and an outer peripheral surface for forming the preliminary side wall portion. a compression punch adapted to compress a side wall portion of a workpiece in an axial direction, the workpiece including a bottom surface portion and the side wall portion which is cylindrical and provided to extend upright from an outer peripheral end portion of the bottom surface portion; a compression die disposed to face the compression punch in the axial direction and having a toothed shape formed on an inner peripheral surface of the compression die; and dies adapted to restrain the bottom surface portion, namely: a first restraint punch, a second restraint punch that is disposed at a position at which it faces the first restraint punch, characterised by a third restraint punch that is disposed outward of the first restraint punch; wherein the side wall portion is disposed inward of the inner peripheral surface of the compression die; the compression punch is adapted to contact the compression die, and to push the compression die thereafter such that both the compression die and the compression punch relatively move in the axial direction with respect to the workpiece that is restrained by the first restraint punch, the second restraint punch and the third restraint punch; both the compression die and the compression punch are adapted to move in the axial direction even after the compression punch contacts the compression die and the side wall portion is bulged to tightly contact the compression die; and a toothed shape is formed on the side wall portion to form the ring gear portion by thickening a preliminary side wall portion; wherein the first restraint punch comprises a projection portion, a first distal-end face and a second distal-end face for contacting the workpiece, wherein the second restraint punch comprises a first distal-end surface and a second distal-end surface facing the first restraint punch and having an outer peripheral facing surface and a toothed shape formed on an outer peripheral surface, and wherein the third restraint punch being disposed outward of the first restraint punch, comprises a distal-end face facing the second restraint punch, and an outer peripheral surface for forming the preliminary side wall portion.