To provide a manufacturing method of a resin emulsion which can shorten the polymerization time as compared with a conventional manufacturing method and can restrain the contamination of coarse particles, and provide a resin emulsion composition being reduced in the contamination of coarse particles.

In the method of manufacturing a resin emulsion by performing the emulsion polymerization of a vinyl monomer emulsified using an emulsifier, polyvinyl alcohol is used as the emulsifier, and the particle size of the droplets of the emulsified vinyl monomer is controlled to be 0.1-500 m.