The study is based on the research analyses of K.V.  Petrides’ (2011) trait emotional intelligence construct verified by his Trait Emotional Intelligence Questionnaire-TEIQue. Verification of the EI trait construct by stepwise regression analysis confirmed that it is determined only to a certain extent by the Big Five personality factors theory (14%) (by the TIPI questionnaire, Gosling, 2003) and by perception and experiencing of positive (15%) and negative (13%) mental states (by the SEHW questionnaire, Džuka & Dalbert, 2002). Thus, the emotional intelligence trait as a consistent construct partially captures individual variability of emotional aspects otherwise scattered across personality theories.