A sports competition is a measure of success for an athlete. However, factors affecting an athlete's success come from the athlete and all competition aspects, including referees. Referees need to have a good reputation before and after carrying out their role as court judges. A referee must have competencies, including refereeing skills, rules of the game/competition, physical condition, mental-psychological conditions (self-confidence, calm, consistency, the assertiveness of attitudes and actions, accuracy in weighing and deciding, high motivation, honest & sincere, socializing). Thus, this research aims to examine the effect of physical conditions, primarily components of endurance, eye-hand coordination, and self-confidence, as psychological aspects that strengthen the referee's performance. To achieve this research's objectives, a survey method was used using path analysis and measurement techniques in tests through standard performance evaluation of volleyball referees, confidence questionnaires, 12 minutes running fitness test, and eye-hand coordination. The population involved in this research was 335 referees who had regional and national diplomas. The sample of this research used the Slovin pattern with an error rate of 10%, so that the sample amounted to 77 volleyball referees in West Java. The conclusions of this research are (1) Endurance affects the performance of the referee by 42.9%, (2) Eye-hand coordination affects the performance of the referee by 39.6%, (3) Confidence affects the performance of the referee by 45.8%, (4) Endurance affects self-confidence by 51.2%, (5) Eye-hand coordination affects self-confidence by 40.8%.