Descriptive cross-sectional, quantitative study, aimed to identify the level of depression in a sample of informal caregivers of Alzheimer's patients, composed of 52 subjects. Consideration was given to the following inclusion criteria: primary informal caregiving, with at least 3 months in the care of the patient, with no financial compensation and taking care of non-institutionalized patients. The Depression Inventory (state / trait)IDER, was applied on the sample; The results of the test show a 46.2% in the scale of total state, and a 51.9% in euthymic state subscale, showing also a high incidence of depression. In full scale of trait, there is a total absence of 76.9%, but in the dysthymia subscale, the trait had an absence of 88.5%, therefore, there is no relevance in terms of the level of depression as a trait.