Content ratio of the poly- lactic acid resin 50 mass % consists of the resin composition above, being high intensity by comparison with past, for example the copier and the printer etc being relatively large-sized, it designates the offer of the poly- lactic acid resin injection molding item which can apply as the component which it uses for the product whose mass is high as topic. The poly- lactic acid type resin and resin composition which includes with the super engineering plastics fiber ejecting forming, being the formation item which becomes, content ratio of the lactic acid component in the aforementioned resin composition: A (mass %) and content ratio of the aforementioned super engineering plastics fiber: B (mass %), average thickness of the aforementioned formation item: X (mm) and mass: Y (kg), and length of the aforementioned super engineering plastics fiber: L (millimicron) and diameter of section: D the above-mentioned topic is solved (millimicron) with the expedient, formation item which satisfies the relational expression of specification.
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