en روانسنجي Psychometric پژوهشي Original Research Article <div style="text-align: justify;"><strong>Objective:</strong> Binge eating is a transdiagnostic construct and one of the main components of eating and emotional disorders. Meta-cognitive beliefs about eating play an important role in the maintenance of binge eating. The Eating Beliefs Questionnaire (EBQ-18) is a self-report questionnaire, which measures negative, positive, and permissive beliefs about binge eating. This cross-sectional study aims to assess the psychometric properties of the EBQ-18 in a community sample.<br> <strong>Methods:</strong> A total of 501 participants (413=females, 88=males) were selected through multi-stage cluster sampling and were administered the EBQ-18, the Binge Eating Scale (BES), the Dutch Eating Behavior Questionnaire (DEBQ), the Body Image Concern Inventory (BICI), the Acceptance and Action Questionnaire (AAQ-II), and the Intolerance of Uncertainty Scale (UIS). Construct validity, internal consistency, convergent and divergent validity of the EBQ-18 were determined using Exploratory Factor Analysis, Confirmatory Factor Analysis.<br> <strong>Results:</strong> The EBQ-18 possesses a three-factor structure and a high internal consistency (&alpha;=.91). The EBQ-18 showed convergent validity with the BES and the DEBQ, divergent validity with the BICI, AAQ-II, and The UIS.<br> <strong>Conclusion:</strong> The goodness-of-fit indices were acceptable and the data showed adequate fit to the three-factor model. In conclusion, findings provide initial support for the validity and reliability of the EBQ-18.</div> Bulimia, Binge eating, Eating disorder, Eating Beliefs Questionnaire (EBQ-18), Psychometric, A Transdiagnostic Measure 247 257 http://jpcp.uswr.ac.ir/browse.php?a_code=A-10-772-1&slc_lang=en&sid=1 Hanieh Alasty h.alasty@yahoo.com 0000-0001-8916-9870 No Department of Clinical Psychology, Kharazmi University, Tehran, Iran. Jafar Hasani hasanimehr57@yahoo.com 0000-0002-7061-9330 Yes Department of Clinical Psychology, Kharazmi University, Tehran, Iran. Mehdi Akbari Akbari.psy@gmail.com 0000-0003-1576-5711 No Department of Clinical Psychology, Kharazmi University, Tehran, Iran. Shahram Mohammadkhani Mohammadkhani@khu.ac.ir 0000-0001-7541-6412 No Department of Clinical Psychology, Kharazmi University, Tehran, Iran.