This study was conducted as a follow-up to an exploratory study to conceptualize social media influencer source types. The main objective of this study is to develop a scale with reliability and validity for the social media influencer source types derived from previous studies. This was accomplished by conducting a literature review, an expert survey(n=15), a preliminary survey(n=50), and a main survey (n=500). As a result of the study, In the contents dimension, 30 measurement items of 5 factors were developed, including 7 items of vicarious satisfaction type, 7 items of information transmission type, 6 items of drama type, 5 items of participation-inducing type, and 5 items of emotional empathy type. And in the channel dimension, 26 measurement items of 5 factors were developed, including 6 items of virtual type, 7 items of commerce type, 5 items of vlog type, 4 items of non-face type, and 4 items of sponsor type. This resulted in a total of 56 measurement items from 10 sub-factors of the 2 construct dimensions. The significance of these findings is that by developing a systematic measure of social media influencer source types, this study provides a new perspective on the influencer selection process and lays the groundwork for its expansion. In particular, this study is significant in that it provides a practical tool that can contribute to increasing the effectiveness of influencer marketing based on various content types and channel characteristics.