The aim of this study was to estimate the average reliability for the reliability coefficients created by the studies using the “Mathematics Anxiety Scale for Primary School Students” (MASPSS) in their research and to examine the reasons for the variation of the reliability coefficients created in each study. A reliability generalization meta-analysis study was conducted by bringing together the Cronbach's alpha values of 34 studies that met the inclusion criteria determined in the study. The Cronbach alpha values used in the studies were converted to the transformed coefficient values by applying the Bonett transform formula, and the analyzes were carried out under the random effects model. The mean Cronbach's alpha coefficient value of the MASPSS scale used in the study conducted with the random effects model was 0.85 (95% CI: .841-.869), and this result was statistically significant (p