This paper proposes an evaluation method of distribution of shaft flexibility of golf club by real swing. Head speed of the club, stability of direction of a ball, reliability of impact at the sweet spot and feeling of the club under the swing are used for the evaluation. First, difference of swing by three types of distribution of shaft flexibility is discussed for high and middle beginner level golfers. Next, stability of direction and reliability of impact at the sweet spot are measured and these mean values and distributions are obtained. Questionnaire of feeling of the club of swing are performed and these data are statically analyzed and obtained principal component and coefficient of correlation of each item. From these data, the best distribution of shaft flexibility of golf club is evaluated by evaluation function which would be decided by players requirement.