The research is a scale development research that aimed to develop a valid and reliable measurement tool that may determine the science course-focused student responsibility levels of primary school students. The research was carried out in three central districts in Kayseri province in the 2018-2019 academic year. The research' sample was made up of three different study groups and research was carried out with the participation of 870 students. The data of the first study group were used for the pilot application phase, the data of the second study group for the exploratory factor analysis (EFA), the data of the third study group for the confirmatory factor analysis (CFA). As a result of the validity-reliability analysis of the study by adopting a Likert-type scale development model, a 17-item scale structure with Cronbach Alpha internal consistency coefficient 0.87, consisting of 4 factors, was collected, which explains 50.83% of the total variance.