shallow side concave of plastic parts requires small core-pulling distance, yet when the molding area of side concave is large, a large core-pulling force is thereby needed, therefore, tilted lifter mechanism can be adopted for side parting and core-pulling. The characteristic is that the pushing force of the ejector is applied to drive the sideway movement of the tilted lifter, and that the sideway parting and core-pulling action is completed by the tilted lifter along with the ejecting and stripping of plastic parts.