To lessen a particle size of a resin in an aqueous emulsion in order to form a thinner coating surface of a good appearance using an aqueous emulsion material of a smaller amount.

The size of a coarse particle of a resin in an aqueous emulsion can be lessened by a manufacturing method of an aqueous emulsion which is a manufacturing method of an aqueous emulsion containing a resin and an emulsifier, and includes: a process which carries out melt kneading of the resin and the emulsifier; and a process which distributes a kneaded product obtained at the previous process in an aqueous solvent.