This paper describes about a study of binocular fusion for the target size of random dot stereogram. As a result, a maximum disparity for binocular fusion increased as an enlargement of the target size, and the disparity showed a tendency of saturation or asymptotic increase at more than 30 or 40 degrees. Moreover, a maximum disparity in the case of changing both the component of spatial frequency and the target size was investigated, the value of disparity was a little difference at the small size target of involving any frequency components. But the maximum disparity for binocular fusion increased at the target of wide horizontal visual angle and involving high frequency components.
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