Provided is a carboxy-modified synthetic isoprene polymer latex for dip molding use, which is produced by the graft polymerization of a synthetic isoprene polymer with a monomer having a carboxyl group in an aqueous phase and contains at least one anionic surfactant, wherein a carboxy-modified synthetic isoprene polymer that constitutes the carboxy-modified synthetic isoprene polymer latex has a tetrahydrofuran-insoluble content of 30 wt% or more.提供一種浸漬成形用羧基改性合成異戊二烯聚合物乳膠，其係在水相中使具有羧基的單體對合成異戊二烯聚合物進行接枝聚合而得到之羧基改性合成異戊二烯聚合物乳膠；其含有至少一種陰離子性界面活性劑，而且構成前述羧基改性合成異戊二烯聚合物乳膠之羧基改性合成異戊二烯聚合物之不溶於四氫呋喃的量為30重量%以上。
