The purpose of this study was to develop a scale to measure learning outcomes. In addition, this study attempted to verify the validity of the scale. Based on the results of a literature review, 35 items are developed. These 35 items were then reviewed by three experts and five adult learners. As a result of this process, the number of items was reduced from 35 to 24 items. For the revised-item analysis, 158 adult learners who had completed a course in a lifelong learning institute were chosen for the survey. Through Exploratory Factor Analysis(EFA), two items were deleted. Finally, 22 items in 5 categories were developed based on EFA. To verify the validity of the scale, Confirmatory Factor Analysis(CFA) was conducted with the 263 participants. The model fit of the scale was good. In addition, the factors were correlated with each other and their reliability was good. This study therefore suggests that the reliability and validity of the scale was appropriate. This scale can help evaluate the learning outcomes of learners in a lifelong education institute.