Psychological and interdisciplinary problems of individuality are analysed. There are spatial-temporal, model, intensity, probability, causal-effective and estimative aspects of subjective reality which in itself is the most important level of individuality's existence. Individuality is a system of common to all mankind phenomena, of middle-level joinings (national, sexual, cohort, professional and so on) as well as of unique individual phenomena. Three-level structure of identity is based upon these levels of individual reality.