The article details the validation procedure for a questionnaire that analyzes the perception of the causal factors of the COVID-19 pandemic, the CFPQ-COVID-19. A pilot test was carried out with 55 subjects, its content and comprehension validity was analyzed through the judgment of 8 experts, and its construct validity through an exploratory factor analysis. In addition, a confirmatory factorial analysis was carried out with a sample of 427 people, the convergent validity was calculated, and a descriptive and internal consistency analysis of the factors of the final questionnaire was performed. The CPFC-COVID-19 finally comprised 20 items and four dimensions: Social distancing and Protection (SDP), Perceived psychological impact (PPI), Skepticism (S) and Credibility of perceived information (CPI). The results demonstrated the validity of the questionnaire and high reliability rates, which allows us to determine the perceptions of the population about the causal factors of COVID-19.