Sports vision based tennis player training support system is proposed. In sports, gaze, dynamic visual acuity, eye movement and viewing place are important. In sports vision, Static eyesight, Dynamic visual acuity, Contrast sensitivity, Eye movement, Deep vision, Instant vision, Cooperative action of eye, hand and foot, and Peripheral field are have to be treated. In particular for the tennis, all of the items are very important. Furthermore, trajectory of gaze location and tennis racket stroke gives some instructions for skill-up of tennis play. Therefore, sports vision based tennis player training system is proposed. Through experiment, it is found that the proposed system does work well for improvement of tennis players' skills. Keywords-Sport vision; static eyesight; dynamic visual acuity; contrast sensitivity; eye movement; deep vision; instant vision; cooperative action of eye; hand and foot; peripheral field I. INTRODUCTION Sports vision based tennis player training system is proposed. There is Sport Vision Association in Japan 1. In sports, gaze, dynamic visual acuity, eye movement and viewing place are important. In sports vision, Static eyesight, Dynamic visual acuity, Contrast sensitivity, Eye movement, Deep vision, Instant vision, Cooperative action of eye, hand and foot, and Peripheral field are have to be treated. In particular for the tennis, all of the items are very important.