The purpose of the study was to develop a teaching efficacy scale for infant/toddler teachers and to examine its validity and reliability. First, based on the literature review, the first draft was determined by extracting the three constructs of teaching efficacy, the second draft was prepared through the experts’ reviews, and the third draft was completed by conducting a pilot study. The final scale of 30 questions was confirmed by item analysis and the item contents. The construct validity was checked by models’ goodness of fit and the standardized factor loading (β=.729~.859) via confirmatory factor analysis, the content validity was reviewed by experts, and the criterion-related validity was confirmed through the correlation analysis with the existing scales (r=.540, p<.001). In terms of reliability, the results of item internal consistency reliability (Cronbach's α) were .981 and the results of test-retest reliability (r) were .745, confirming that this scale is a stable and consistent scale. The scale developed in this study is able to more accurately measure the teaching efficacy of infant/toddler teachers and use the results for research and practice.