Purpose: verify the effect of the use of hearing aid in hearing impaired subjects through a selfassessment questionnaire. Methods: the questionnaire International Outcome Inventory for Hearing Aids was used to validate the results. 22 hearing aid users, aged 32 and 85 years, with bilateral sensorineural hearing loss from mild to severe, post-lingual, were evaluated. All participants were users of amplification with unilateral or bilateral adaptation for at least 12 weeks. Results: the mean total score obtained in the application of the questionnaire was 27 and there was no significant difference (p = 0.191) between scores on the seven questions in the questionnaire, being the average of 3.85 points. There was no correlation of results either with the patients' age or with time of amplification. There was no significant difference in the total score of the questionnaire as well as factors 1 and 2 when considered: degree of hearing loss, audiometric configuration, hearing aid model and unilateral or bilateral adaptation. Conclusion: through the application of the questionnaire it was found that the use of sound amplification has beneficial effects for their users and that they were satisfied with their use.