The article scrutinizes upon such definition as staff motivation in the light of coincidence of the employees’ personal interests with the work environment. Psychological model of labour interests is given as a prototype of a possible scientific concept, which still has a lot of blank spaces and resources for the scientific research. Besides, the article presents the results of a pilot research performed in the frame of the study of the personnel’s labour interests in the Russian companies. The theoretical aspect highlights the phenomenological description of the structure and psychological model of labor interests. The practical aspect proves the relevance of the influence of the workers’ labor interests on their labor activity and productivity.