Mites constitute the most various group of animals and their study is of undoubted interest. Special interest is caused by the comparison of acarocomplexes of houses and another objects. The study of structure of acarocomplex of domestic dust was conducted in 842 objects of Rivne region (houses, kindergartens, medical, communal). The most populated with allergens mites was houses – 67%. Acarologic inspection showed predominance of Dermatophagoides pteronyssinus in domestic and suggested the existence of powerful allergic trigger.