This study was aimed to examine relationship between wise words of sport coachs and athletes' performances.
We used, as an instance, relationship between the late Mr.Kazuomi Tokuda, who was called one of the best coach in the world of swimming and Nobutaka Taguchi, gold medalist of the 1972 Olympic in Munich. By that we examined, with the interview to Taguchi, words spoken in the situation of coaching, how the words were told to the athletes and how effective they were.
As the result, some points were indicated as follows.
(1) There is a necessity of eyes to find athlete's gift and talent, words to stimulate athlete's motivation to improve.
(2) Athlete's come into bloom and become successful only when hard practice and training are continued under a coach with superior gift and talent. And also it is essential to praise athletes skillfully to make them feel confident.
(3) Strict practice and hard training are of course necessary, but dogma that admires guts and takes too much credit in those should be excluded.
(4) There is a need to think positively even he or she faces failures or discouragements.(5) Before a match or a game, it is important for an athlete to imagine herself or himself of the future as a winner of the following match.
Moreover, mutual trust must be the foundation of cases which words from a coach have influence to heighten performances of an athlete.

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