In this paper we investigate whether joint attention should be achieved between a human and a vague embodied agent by conducting an experiment. Joint attention plays an important role in making conversation smoothly and fulfilling sympathy for each other. And the effect of joint attention has been proved between humans and agents. In this experiment, humans are directed their attention to the certain location by agent’s instructions consisting of demonstrative pronoun. We made observations of the special relation between human and agent, and the human responses to the agent’s instructions. What the vague embodied agent is a sphere like bowling ball and its appearance doesn’t show where its attentions are turned makes people be unknown its directivity of attention. The result shows that it’s possible to achieve joint attention between human and the agent even if the agent’s appearance is too simple and doesn’t show where its attentions are turned.