There are few researches of emotional sphere of a person concerning its style peculiarities. Most of them are based on personality concept. This article deals with emotional style studies based upon activity concept. The notion of emotional experience as an activity and individual emotional style (IES) concept enables the author to consider IES as a new aspect of emotional style research and of integral individuality theory. The correctness of including IES into integral individuality studues is theoretically justified by the analysis of IES original conditions, its stability and the possibility to mark out its hierarchial levels. Like individual activity style hierarchy, IES contains such levels as intermediate purposes, operations, reactions, having special psychological substance.