To provide a polylactic acid bottle which has a vapor-deposited film on the inner surface of the bottle wall, was effectively prevented from thermally deforming during film deposition, and functions as an excellent barrier to oxygen and water. ¢MEANS FOR SOLVING PROBLEMS! The bottle comprises a bottle wall made of a biodegradable resin and a vapor-deposited film formed on the inner surface of thebottle wall by the plasma-assisted CVD method, and is characterized in that the vapor-deposited film in analysis by FT-IR spectroscopy has hydrocarbon peaks attributable to CH, CH2, and CH3 in the wavenumber region of 3,200-2,600 cm-1, the proportion of CH2 and that of CH3 to the sum of CH, CH2, and CH3, which are calculated from these hydrocarbon peaks, being 35% or lower and 40% or higher, respectively.