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The objective of this study was to examine the effects of kumdo instructors’ leadership on trust in leader, additional effort, and leadership effectiveness. For this purpose, we sampled from the population of adult players enrolled at the Haedong Kumdo Federation currently as of 2009, and analyzed data on 247 kumdo players. From the research method and results were drawn conclusions as follows. First, among the sub‐factors of transactional and transformational leadership, transactional leadership (management by exception, contingent rewards, p<.001) and transformational leadership (intellectual stimulation, charisma, individualized consideration, p<.001) had a significant effect on trust in leader. Second, among the sub‐factors of transactional and transformational leadership, transformational leadership (individualized consideration, intellectual stimulation, charisma, p<.001) had a significant effect on additional effort. Third, among the sub‐factors of transactional and transformational leadership, transactional leadership (contingent rewards, p<.01) and transformational leadership (intellectual stimulation, charisma, individualized consideration, p<.001) had a significant effect on leadership effectiveness. Fourth, trust in leader had a significant effect on additional effort (p<.001). Fifth, trust in leader had a significant effect on leadership effectiveness (p<.001).