To inexpensively manufacture a skin material-integrated foam-molded headrest good in the touch and feeling due to a skin single material by using the skin material comprising the skin single material such as a fabric or the like and preventing the excessive impregnation of the inner bottom surface of the skin material with the foamed resin filling the interior of the skin material from a resin injection nozzle.

A foamable resin 3' charged from the open port of the skin material by a resin injection nozzle 5a (5b) is applied to the core material 2 inserted in the skin material 1 to cast the foamable resin 3' flowing along the axial line 2b (2c) of the core material 2 up to the inner bottom surface of the skin material 1.