The present invention relates to a carboxylic acid-modified nitrile-based copolymer latex composition and a dip molded article including the same, the composition including: a carboxylic acid-modified nitrile-based copolymer latex having a glass transition temperature of −30 to −20° C.; and a bentonite dispersion solution. The dip molded article using the carboxylic acid-modified nitrile-based copolymer latex composition according to the present invention has high tensile strength and excellent wearable sensation, and thus the dip molded article may be usefully applied to dip molded latex articles such as surgical gloves, checkup gloves, a condom, a catheter, industrial gloves, household gloves, or health care articles.