Although all kinds of knowledge is valuable, some non-scientific knowledge can cause confusion on students' minds. Science-pseudoscience distinction should be taught in all levels of education to protect especially young age students from this confusion. It is hard to change gained beliefs so giving importance to demarcation from elementary to university levels needs to be the noticed. In this study it is aimed to develop a scale for science- pseudoscience distinction for elementary school students. For this purpose data was collected from 717 students who were attending 5th, 6th, 7th and 8th grades. 20 items scale was created by structural equation modeling. Lisrel 8.7 programme was used for analyze. The observed fit indexes were X[superscript 2]/sd 3.21, RMSEA 0.056, RMR 0.0077, SRMR 0.048, GFI 0.93, AGFI 0.9, CFI 0.95, NNFI 0.94. All values were found acceptable according to literature. KR-20 internal consistency coefficient for the test was calculated and found as .836. Therefore according to findings, the scale which was named as "Widely Accepted Opinions Scale" and was developed by this study is a valid and reliable data collection tool for elementary school students.