<p>In this study, the authors examined behavioral characteristics during viewing 360-degree (360) images by measuring time-series change of body part rotations. In the experiment, two conditions were prepared. First was the HMD condition which a simple head-mounted display using a smartphone was used, and second was the LCD condition which a LC display with similar viewing angle was used. Four types of still images with different number of gaze targets were presented as the experimental stimuli. Under the two experimental conditions, body part rotations of the participants and subjective indexes on motion sickness and visual fatigue were measured and analyzed. From the results of the experiment, the authors found a common tendency of the late and peak in the time series rotation of body parts. The authors discussed further results of the experiment in terms of the basic tendencies of behavioral changes by viewing 360 images.</p>