The aim of this study was to evaluate the reliability and construct validity of the Valencian/Catalonian version of the Spanish Burnout Inventory (SBI) in a sample of non-university teachers from the Valencia province (Spain). The sample consisted of 1359 teachers (67.2% were women). This instrument contains 20 items distributed into four dimensions: Enthusiasm toward the job (5 items), Psychological exhaustion (4 items), Indolence (6 items) and Guilt (5 items). The psychometric properties were examined through the following analyses: confirmatory factor analysis (CFA) and reliability (Cronbach's alpha). All items achieved appropriate values for both statistical and psychometric parameters, just as the four scales did. The four-factor model consistent with the Spanish original obtained a good data model fit: AGFI =.926, NNFI = .919, CFI = .930, RMSEA = .053(.050-.057). The Cronbach's alpha value was acceptable for the four scales of the instrument. These results contribute to the psychometric validation of the questionnaire, allowing to conclude that the CESQT, in Valencian / Catalan, is a reliable and valid instrument for evaluating the SQT in non-university teaching personnel.