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PP (Polypropylene) has been used by approximately 50% of the entire resin for vehicle bodies. By unifying PP grade of interior trimming parts which mainly uses PP, to one type, the goal of this study is to achieve the following; (1) improvement of material recycling, (2) efficient parts development (3) material cost reduction. In molding trimming parts, the suppliers use PP of different grades, and different pigments are colored and compounded for vehicle model, grade, model years. So the material combinations are numberless. These various material combinations caused a great loss in the process from producing materials to manufacturing parts, and made the material recycling of waste plastics difficult. At first, Subaru selected one kind of PP grade, talc grade, and pigment for one color, then fused and mixed three components in injection molding.