Questionnaire for Measuring Stressors and Intensity of Parental Stress is originally developed for the purpose of measuring parenting stress among parents of preschool children. The aim of this study was to examine its psychometric characteristics when administered to parents of lower primary school children in order to determine its applicability to other samples. Data was collected through an online survey and the final sample consisted of 275 mothers and 33 fathers. Mothers' results demonstrate satisfactory internal consistency reliability of each subscale and the Questionnaire as a whole. Two factors that explain 65.83 % of the total variance of mothers' results were extracted. The first factor includes the characteristics of the child and the direct parent-child interaction, and the second factor includes the contextual sources of parental stress. Convergent validity is established by statistically significant positive correlations between the Questionnaire for Measuring Stressors and Intensity of Parental Stress overall scores and levels of stress, depression, anxiety, and external locus of control. Fathers' results demonstrate acceptable internal consistency reliability of the Questionnaire as a whole and of each subscale, except the Parental Attachment subscale. Positive correlations were also found between the fathers’ overall results on the Questionnaire and the level of stress, depression, and anxiety, but the correlation with the external locus of control was not statistically significant. Factor analysis of fathers’ scores was not conducted due to insufficient sample size. Results of conducted psychometric validation are in favor of applicability of the Questionnaire to mothers of lower primary school children. Larger sample size is needed to draw conclusions about the applicability of the Questionnaire to fathers. Finally, parents of lower primary school children reported experiencing mild parental stress in this study, with mothers reporting more intense parenting stress than fathers.