A structural body of differing thicknesses are provided that is made of resin, and a method of manufacturing thereof, that can improve quality in a case in which plate thickness changing portions extend in plural directions. A first panel portion and a second panel portion are connected by a first gradually changing portion. The first panel portion and a third panel portion are connected by a second gradually changing portion. The second panel portion and the third panel portion are connected by a third gradually changing portion. Further, an opening portion is formed to pass-through a door inner panel at a position where respective extensions of the first gradually changing portion, the second gradually changing portion and the third gradually changing portion intersect one another as seen in a plate thickness direction.

A rod-shaped element having an outer diameter, which is the same as an outer diameter of a completed rod part, has one axial end portion and the other axial end portion to which a base end portion of a bifurcated yoke is fixed. The one axial end portion is subject to plastic working for diametrically deforming an outer periphery of the one axial end portion. Thereby, the outer periphery of the one axial end portion is formed with a male spline part having a groove bottom diameter smaller than an outer diameter of a rod part and having a tooth tip diameter larger than the outer diameter of the rod part.

A rod-shaped element having an outer diameter, which is the same as an outer diameter of a completed rod part, has one axial end portion and the other axial end portion to which a base end portion of a bifurcated yoke is fixed. The one axial end portion is subject to plastic working for diametrically deforming an outer periphery of the one axial end portion. Thereby, the outer periphery of the one axial end portion is formed with a male spline part having a groove bottom diameter smaller than an outer diameter of a rod part and having a tooth tip diameter larger than the outer diameter of the rod part.

The invention relates to a subframe for a motor vehicle, comprising an upper shell, a lower shell made from a fiber-reinforced plastic and a rib structure for stiffening the upper shell, wherein the upper shell is composed of a metallic material and the rib structure is composed of a plastic reinforced with short fibers and is formed integrally from the lower shell. The invention furthermore relates to a method for producing a subframe, wherein the lower shell together with the rib structure connected integrally therewith is formed from a stack of plies of a fiber-reinforced thermoplastic and joined to an upper shell made from a metallic material.

The invention relates to a subframe for a motor vehicle, comprising an upper shell, a lower shell made from a fiber-reinforced plastic and a rib structure for stiffening the upper shell, wherein the upper shell is composed of a metallic material and the rib structure is composed of a plastic reinforced with short fibers and is formed integrally from the lower shell. The invention furthermore relates to a method for producing a subframe, wherein the lower shell together with the rib structure connected integrally therewith is formed from a stack of plies of a fiber-reinforced thermoplastic and joined to an upper shell made from a metallic material.