To provide a polylactic acid-containing aqueous dispersion which is capable of forming a transparent film at room temperature. A polylactic acid-containing aqueous dispersion which contains: (1) a polylactic acid； (2) one or more plasticizers selected from the group consisting of dimethyl adipate, diethyl adipate, dipropyl adipate, diisopropyl adipate, dibutyl adipate, diallyl adipate, bis(2-butoxyethyl) adipate, bis(2-methoxyethyl) adipate, dimethyl succinate, dimethyl glutarate, diethyl sebacate, diisopropyl sebacate and mixtures of these compounds； (3) one or more dispersion stabilizers selected from the group consisting of cationic polymer compounds, anionic polymer compounds, polyvinyl alcohols and nonionic surfactants； and (4) water.本發明提供一種可於室溫下形成透明皮膜之含聚乳酸之水系分散體。該含聚乳酸之水系分散體含有：(1)聚乳酸；(2)選自己二酸二甲酯、己二酸二乙酯、己二酸二丙酯、己二酸二異丙酯、己二酸二丁酯、己二酸二烯丙酯、己二酸雙(2-丁氧基乙基)酯、己二酸雙(2-甲氧基乙基)酯、丁二酸二甲酯、戊二酸二甲酯、癸二酸二乙酯、癸二酸二異丙酯、及該等之混合物所組成之群中之一種以上塑化劑；(3)選自陽離子性高分子化合物、陰離子性高分子化合物、聚乙烯醇及非離子性界面活性劑所組成之群中之一種以上分散穩定劑；及(4)水。
