A hybrid simulator is a simulator which embeds a hardware experiment in a numerical simulation. However, the hybrid simulator is generally subjected to an inherent problem of energy increase in collision of two hardwares in the loop because of delay times. To solve this problem, Osaki et al. proposed a compensation method of delay time that can realize a variable coefficient of restitution . However, the above method has a drawback that a model error of the system degrades the accuracy of the compensation method. This paper describes the influence of the model error and proposes a new approach to improve the accuracy of delay time compensation based on the coefficient of restitution by introducing a new model of the system. A collision experiment by the hybrid simulator is carried out to validate the accuracy of the proposed compensation method compared with the conventional compensation method.