The twenty one groups, each of which consisted of a P-confederate who played a task-oriented role, a M-confederate who played an emotional-supportive role and a naive subject were employed in this study. All of the three participants entered an experimental room which was completely isolated from external environments and performed the same task for several hours. In the eleven of the twenty one groups, the P-confederate went out the room after one hour and then the M-confederate went out after two hours and finally the subject was left alone. (PM-condition) . In the other groups, the M-confederate went out of the room first and then P-confederate went out (MP-condition). Subjects tended to show the highest unpleasantness and subjective anxiety and the lowest morale for the task when they were left alone. However, there were not any differences in this tendency between these two conditions. The subjects showed more familiality to the M-confederate than to the P-confederate. While Ss' evaluation on the M-confederate's task-expertness decreased when he went out in the MP-condition, this evaluation was not changed in the PM-condition. Immediately after the P-confederate went out, Ss' demand for other's task-oriented behavior increased in both condition. Although, subjects decreased their evaluation on the emotional-supportive behavior of M-confederate after he went out, they did not change their demand for other's emotional-supportive behavior. From these results, it is assumed that subjects performed the task as a coping strategy for the stress and anxiety which caused by a socially isolated situation.