PURPOSE: To enhance the cushioning properties and soft feeling of a skin material in a method for producing an interior part for a car by integrating the skin material by a slush molding and a resin core material by a mold press molding under pressure.

CONSTITUTION: A slush skin layer 11a and a slush foaming layer 11b are provided to the inner surface of an electroforming mold 20 and, after a glass mat 12 molded into a desired shape is temporarily bonded to the inner surface of the slush foaming layer 11b, the slush foaming layer 11b is foamed under heating to integrate the glass mat 12 with the inner surface of a skin material 11 in a state keeping the soft feeling of the skin material without damaging the cushioning capacity thereof.