Human walking is affected by vision, vestibular, somatic and other various sensations that come through the sensory-motor loop. But detail of the sensory-motor loop is not clear. In this study, we examined a possible affect of self motion sensation by an optical-flow stimulus in peripheral vision with a decayed somato-sensory feeling by a vibration stimulus on leg and foot area. In this experiment, we presented the optical flow for forward direction to the peripheral vision, and then gave the self-motion sensation by changing the flow to left or right direction. We examine the change of walking direction toward opposite of the self-motion sensation because of the decayed somato-sensory feeling. In this paper, we discuss on the sensory fusion mechanism of visual and somatic sensations based on the experimental result.