Polylactic acid formed body having a vapor-deposited film and method of producing the same

A method of producing a polylactic acid formed body having a vapor-deposited film, comprising the step of feeding, as the reaction gas, a gas of at least one kind of hydrocarbon compound selected from aliphatic unsaturated hydrocarbons and aromatic hydrocarbons, and vapor-depositing a hydrocarbon film on the surface of a stretch-formed body of a polylactic acid by a plasma CVD, wherein

• said stretch-formed body of the polylactic acid exhibits a sharp X-ray diffraction peak in which a half-width of diffraction peak measured over a range of 2θ=10° to 25° in a wide angle X-ray measurement with a source of Cu—Kα ray (30 kV, 100 mA) is not more than 1.22°, and
• in the step of vapor-depositing said hydrocarbon film, a plasma-treatment is conducted with a small output in the initial stage of forming the film to form a high CH2 layer having a ratio of CH2 per the total of CH, CH2 and CH3 of not less than 40% and, next, the plasma-treatment is conducted with a large output to form a low CH2 layer having a ratio of CH2 per the total of CH, CH2 and CH3 of not more than 35%,
• the plasma-treatment with the small output and the large output is conducted by using microwaves, and the plasma-treatment with the small output is conducted with the output of 350 to 600 W while the plasma-treatment with the large output is conducted with the output of 1000 to 1400 W.