The mechanical characteristics of a large-sized and a regular-sized racket were examined. The vibration of the rackets as one of the mechanical characteristics was measured and analysed by an impulse response method. The placement accuracy was investigated with the subjects of three different groups; beginers, intermediate players and trained players, and each hit 60 practice shots of a forehand drive and volley with these rackets at an appointed target. The results of this study were as follows; 1) The large-sized racket was 1.5 times larger in hitting area along the center axis than the regular-sized racket. 2) The large-sized racket showed a lesser and more moderate rate of variation in the rebound along the center axis of the racket face than the regular-sized. 3) The ball placement was nore accurate in forehand drive and volley with the large-sized racket than the regular-sized. 4) The bal1 flew farther in the forehand drive volley with the large-sized racket than the regular-sized. 5) The placement accuracy was worsen in the forehand drive and volley with both rackets as the ball speed increased.