As Japan’s population ages, the incidence of falls due to decreased motor function among elderly people has increased. Consequently, there is a growing demand for balance rehabilitation to prevent falls. Traditionally rehabilitation has been conducted on a one-on-one basis between therapist and patient, with evaluations heavily dependent on the therapist’s experience and knowledge. However this method involves a considerable workload for the therapist, which has increased the demand for rehabilitation using automated equipment and quantitative assesment. In this study, we developed a game-based rehabilitation system using multiple-depth cameras and mixed reality (MR) device. The MR device allows for the presentation of moving targets in real 3-D space, while the use of multiple-depth cameras enables tracking of accurate movement tracking with a higher degree of freedom than in previous studies. Our approach aims to alleviate the workload on therapists while also improving the effectiveness of rehabilitation.