The purpose of this study was to investigate the constructs of sport demotivation. To explore the constructs, four open-ended questions were presented to 144 collegiate athletes who are belong to 8 different sport teams. With the inductive and qualitative content analysis, 7 factors were emerged and named for the sport training demotivation; reduced physical condition, excessive training, psychological readiness deficiency, training program dissatisfaction, sport setting, interpersonal problems between teammates, and less skilled performance. And for the sport competition demotivation, 6 factors were classified; negative psychological condition, reduced physical condition, competition leading position, loss of control, less skilled performance, and interpersonal problems between teammates.