Medication use in community-dwelling elderly is considered as an essential factor for symptom management or prevention of complications due to the increase in chronic diseases. However, the elderly have difficulty in using the correct medications due to the deterioration of cognitive and physical function such as vision, hearing, memory, and concentration. Previous studies have identified and presented the individual's competency to influence medication use, but most of them were introduced as fragmentary elements. And the scales presented to comprehensively evaluate the medication use competency of the elderly were limited. Therefore, the aim of this study is to develop the Medication Use Competency Scale(MUCS) for community-dwelling elderly and verify the validity and reliability. The MUCS was developed and validated according to DeVellis' scale development process. In the course of analyzing the concept, concept development of the medication use competency of community-dwelling elderly was conducted according to the Schwartz-Barcott and Kim’s(2000) Hybrid model. In the course, literature review for the theoretical review was carried out to extract the dimensions and attributes of the medication use competency for community-dwelling elderly and to check the suitability of the elderly in the field through in-depth interview. Total 29 literature was reviewed and interview with 8 community-dwelling elderly was conducted. By analyzing and comparing the result of literature review and interview, 4 dimensions with 19 attributes were derived. From the dimensions and attributes identified through concept development, 37 preliminary items were derived. After determining content validity by 7 experts and pilot test conducted by 20 community-dwelling elderly, the scale was revised to include 27 items. For psychometric testing of the developed scale, 245 community-dwelling elderly were surveyed. Construct validity was confirmed through item evaluation and exploratory factor analysis. Twenty-three items explaining a cumulative percentage of 60.03% of the variance were identified and categorized into 5 factors:‘Attitudes (8 items)’, ‘Physical skills (5 items)’, ‘Knowledge (4 items)’, ‘Effort to sustain (3 items)’ and ‘Cognitive skills (3 items)’. Criterion validity was confirmed by examining overall correlation with MMAS-8 (Morisky Medication Adherence Scale). The result of correlation coefficient between the MUCS and MMAS-8 was found to be .40(p