In baseball, a bat is demanded to be comfortable to use and functional for the purpose of exhibiting the best performance. The purpose of this study is discussed the interrelationship between fit feeling in baseball player and physical characteristics of baseball bats. As the material twelve kinds of wooden baseball bats are estimated for physical characteristics. These are evaluated by fifty seven baseball players on the view point of their fit feeling.
　These results are as follows;
　The materials in the same model are similar in the form, but different in the mass, the displacement of the center of gravity and the moment of inertia. The characteristics of vibration is different on each other in these materials. The fit feeling for the moment of inertia is corresponded with physical value. The fit feeling for the characteristics of vibration is not found clearly difference.

DESCENTE SPORTS SCIENCE Vol.18/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE