ARTICLE INFOMental health among high school (SMA) students is an important issue that needs attention. This research aims to develop a mental health scale for high school students, which is expected to be able to detect whether students have mental problems or not, so that students with problems can get fast and appropriate help. Apart from that, this scale is also expected to be able to see the extent to which students' mental development is good. This scale was developed based on three dimensions of mental health, namely peace with oneself, social interaction function, and basic and advanced psychological needs. The research method employed in this study is the quantitative method. Meanwhile the participants involved in this research were 1045 high school students consisting of students in grades 10-12. The analysis technique uses item-total correlation and exploratory factor analysis. The result was that 25 items had satisfactory item-total correlations with values ranging from 0.307 to 0.677. The results of the exploratory factor analysis that has been carried out are the formation of three dimensions with a different distribution of items from the initial design. Apart from that, this measuring tool also has a cumulative proportion of variance explained by factors of 0.434 and a model fit of CFI (0.910) and TLI (0.900). In the future, in-depth research is needed regarding the external validity of this mental health scale, which is correlated with other variables using convergent and discriminant validity methods.