Purpose: This study is aimed at developing Self-Efficacy Inventory of tennis players. Methods: Inventory composed in this manner was applied to 328 tennis players in middle and high schools, universities and professional teams registered with the Korean Sport & Olympic Committee. Various analysis including statistical data, exploratory factor, confirmatory factor and reliability analysis were performed on the basis of the data collected by using SPSS and AMOS. Moreover, confirmatory factor analysis and prediction validity for which the developed index differs in accordance with gender and affiliation were performed. Results: A total of 3 questions were deleted because kurtosis/skewedness was not appropriate in descriptive statistics. As the result of exploratory factory analysis, there was 61.58% dispersion of single factory. As the result of confirmatory factory analysis, appropriateness of structure was confirmed and all the path coefficients with the range of .626~.834 were found to be significant. Therefore, the index for the self-efficacy of tennis player was developed with 10 single factor questions and proportional index in the range of 0-100%. Validity and reliability were also secured. In addition, it demonstrated that self-efficacy can be used in the actual field of tennis by significantly predicting the perceived competition performances and execution of sports. Conclusion: It can be utilized as a useful tool in predicting the self-efficacy of tennis players. It is deemed that there is a need to assess the effects of tennis player and self-efficacy by investigating the relationship among a diverse range of sports variables with the inventory developed in this Study in the future.

INTRODUCTION
 METHOD
  Participants
  Measurement Tool
  Survey Process and Analysis
 RESULTS
  Item Analysis
  Exploratory Factor Analysis and Reliability
  Inter-item Correlation Analysis
  Confirmatory Factor Analysis
  Verification of Criterion-related Validity
 Conclusion
 REFERENCES

• JungHoon Huh(Chung-Ang University)
• HyunWoo Lee(Chung-Ang University)
• EunJi Kim(Chung-Ang University) Corresponding author