In an aqueous dispersion containing a resin component and water that allows the resin component to disperse, the resin component contains composite particles (C) containing an ethylene-unsaturated carboxylic acid copolymer (A) and an acrylic polymer (B), the ethylene-unsaturated carboxylic acid copolymer (A) is produced by copolymerizing a first monomer component containing ethylene and unsaturated carboxylic acid and having an ethylene content of 75 mass % or more, the acrylic polymer (B) is produced by polymerizing a second monomer component containing (meth)acrylate and having a (meth)acrylate content of 50 mass % or more, the acrylic polymer (B) has a glass transition temperature of −28° C. or more and 80° C. or less, and the ethylene-unsaturated carboxylic acid copolymer (A) content relative to the total amount of the resin component is 58 mass % or more and 90 mass % or less.