A dip-forming composition, comprising: a carboxyl group-containing diene-based rubber latex; and one or more compounds selected from the following (a) to (e): (a) an organometallic crosslinking agent containing two or more hydroxyl groups each bonded to a metal atom; (b) a cationic property-deactivated modified polyamine-based resin, a cationic property-deactivated polyamide-epichlorohydrin resin, a cationic property-deactivated polyamine-epichlorohydrin resin, a cationic property-deactivated amine group- or quaternary ammonium base-containing polyvinyl alcohol, a cationic property-deactivated amine group- or quaternary ammonium base-containing polyacrylamide, a cationic property-deactivated amine group- or quaternary ammonium base-containing carbohydrate, or a polyacrylamide, polyvinyl alcohol, or carbohydrate into which a crosslinkable functional group is introduced; (c) an anionic or nonionic polyvinyl alcohol, anionic or nonionic polyacrylamide, or anionic or nonionic carbohydrate to which a water resistant additive or water-resistant polymer is added; (d) a water resistant polyvinyl alcohol; and (e) a cationizing agent.