Spline telescopic shaft, method for manufacturing spline telescopic shaft, and vehicle steering apparatus

A vehicle steering apparatus, comprising:

• a telescopic shaft for vehicle steering including a spline telescopic shaft;
• wherein a steering force is transmitted using the spline telescopic shaft,
• the spline telescopic shaft includes
• an inner shaft having an outer tooth surface formed on its outer periphery, and
• a cylindrical outer shaft having an inner tooth surface arranged to engage with the outer tooth surface and arranged to fit to the inner shaft slidably in an axial direction of the inner shaft,
• either one of the outer tooth surface and the inner tooth surface includes a first resin coating,
• the other of the outer tooth surface and the inner tooth surface includes a second resin coating, and
• the second resin coating is formed by processing for sliding an intermediate member for manufacturing the inner shaft and an intermediate member for manufacturing the outer shaft in the axial direction, to transfer a part of a resin material provided in the intermediate member for manufacturing the shaft including the one tooth surface for forming the first resin coating to the intermediate member for manufacturing the shaft including the other tooth surface.