<p>This study analyzes the psychometric qualities of the Portuguese version of the Psychological Capital Questionnaire (PCQ-24). A sample of 140 Portuguese workers, of whom 83 (59.3%) women, with a mean age of approximately 42 years, with an average of 14 years of work experience, were employed in companies from different sectors of activity. Confirmatory factor analyzes were developed to test five alternative models to the PCQ-24 factorial structure. The results showed that the correlated four factors model, with 23 items, is the one that presents adjustment quality indices with better adaptation to the study sample (<em>X2/df=1.58, GFI=.823, CFI=.936, RMSEA=.066</em>), supporting the original four-dimensional structure: Efficacy (α=.95), Hope (α=.97), Resilience (α=.79) and Optimism (α=.73). It is concluded that this is a useful instrument to evaluate psychological capital although it reinforces the need for future revalidation studies.</p>