It was found that a rich milk coffee beverage comprising a sucrose fatty acid ester with an HLB of 10 or higher, a polyglycerol fatty acid ester, and a sucrose fatty acid ester with an HLB less than 10 had a high emulsion stability [14]. The rich milk coffee beverage had a high emulsion stability that was provided by the incorporation of a sucrose fatty acid ester with an HLB of 10 or above, a polyglycerol fatty acid ester with a cloud point of 50 °C or above (as determined in a 20 wt% aqueous solution of sodium chloride at a concentration of 1 wt%), and a sorbitan fatty acid ester having an HLB of 4 or above [15]. It was also effective to use the combined system with an ionic emulsifier. We found that the combination of P-1670 and an ionic emulsifier, such as sodium lactic fatty acid ester or succinyl fatty acid ester, resulted in a more stable emulsion. The electrostatic repulsion may contribute to the emulsion’s stability.