RESIN MOLDED ARTICLE UNIT AND METHOD FOR MOLDING RESIN MOLDED ARTICLE UNIT

An instrument panel unit () includes an instrument panel () and a decorative sheet (). The instrument panel () includes a sticking portion () and an exposed portion (). A plurality of insertion grooves () and insertion holes (), into which bent pieces () formed at rear end of the decorative sheet () are inserted, are formed alternately on a rear side end of the sticking portion (). A groove front-surface () forming the insertion groove () of the instrument panel () is formed in a tapered shape such that a width between the groove front-surface and an opposing groove rear-surface () gradually increases upward. The bent piece () of the decorative sheet () is thinner than a groove width at an upper part serving as an entrance part of the insertion groove () and thicker than the groove width of a groove bottom-surface () in the insertion groove ().