This study proposes a visual training system for improving baseball hitting ability using an HMD. Conventional training methods such as tee batting can train batting skills, but they cannot train the visual functions necessary for batting. The visual functions that are closely related to hitting ability in baseball include kinetic visual acuity and eye-hand coordination, and training these functions will lead to improved hitting ability. We will construct a visual training system in a VR space that can train kinetic visual acuity and eye-hand coordination while batting using an HMD. By performing batting practice while training sports vision, both batting technique and visual function can be improved. To verify whether the system improves visual function and hitting ability, training was conducted. As a result, significant improvements were observed in the number of hits, kinetic visual acuity, and eye-hand coordination, indicating the usefulness of the proposed system.