Introduction: The State-Trait Depression Inventory is a newly implemented tool for assessing the affective component of depression, but has no instrumental studies in clinical samples. Method: Was evaluated a clinical sample of 103 patients with depression diagnosis (51.5% male) aged between 18 and 59 years (M = 31.72). Using structural equation modeling, was evaluated the model of two oblique factors, euthymia and dysthymia, predominant in literature, in each section of State-Trait Depression Inventory, State and Trait. Results: The two-factor structure was confirmed, similar to the results obtained in other studies. Similarly, was evaluated the reliability of scores and construct reliability, obtaining appropriate indicators. Conclusion: Were confirmed adequate psychometric properties with the study sample. The practical implications and limitations of the study are discussed.